The Doyles help a close family friend beat a manslaughter charge despite the fact that he refuses to defend himself; Jake’s relationship with his ex-wife, Nikki, is heating up when it should be cooling down – and Leslie might be the perfect distraction.

A young woman comes to The Doyles with one case – to find her unknown biological father – but they end up solving three; Jake is distracted by Leslie while trying to extract himself from Nikki.

The Doyles take on a cold arson case for Mal’s old flame to find out the tragic truth of what really happened when a girl died in a bar fire; Jake and Leslie are finally starting to connect when Jake discovers he might be… a daddy?

A wrongfully convicted murderer gets out of prison and offers the Doyles a generous payday if they find the real killer; Jake finds out the truth about Nikki’s pregnancy.

The Doyles start trailing a potentially cheating husband to find he deeply loves his wife but is in deep trouble with some menacing criminals and smugglers; as Nikki moves forward with her new beau, Jake and Leslie take it to the next level.

The Doyles show their sentimental side as they help Jake’s high school girlfriend run off into the sunset with her new husband, who’s running from both bad guys and good guys to just get away; Rose’s past comes back to haunt her in the form of her ex-con husband, while Leslie weighs whether or not she wants Jake in her future.

Jake sets out to find the true identity of a beautiful amnesiac who stumbles across his path and ends up fighting off her two stalkers; Martin Poole refuses to leave town and wreaks havoc in Rose and Mal’s relationship; and Leslie gives Jake the cold shoulder.

A grieving widow hires the Doyles to find out why her husband left a generous sum of money in his will to a woman she’s never heard of. Rose continues to battle with Martin over their divorce while Mal formulates a plan to get Poole out of their lives for good; and Leslie and Jake hit a comfortable stride as friends and colleagues - just as his divorce from Nikki becomes final.

When a dubious chip truck owner notices his truck is missing - along with his driver/best buddy - he cons Jake into taking the case; Martin really crosses a line with Rose and she takes matters into her own hands; and Jake’s divorce becomes final and he’s happy to tell Leslie that he’s now a free-agent. But Leslie’s just been bumped up the ladder with a promotion to Sergeant, and her eye is on the job, not Jake Doyle.

When Mal suddenly leaves town and lends Jake out to be shadowed by a pompous crime novelist looking for inspiration, Jake’s entire life, including his constant relationship woes, is put under the authorial microscope; a simple cheating spouse domestic case turns out to be something far more devious than it first appears; and Jake, expecting the return of his father, gets an unwelcome surprise when it’s not Mal standing in the kitchen to greet him but his troubled older brother, Christian.

Tensions are at an all-time high with Jake's older brother Christian back in town and the Doyles are on a case involving Walter's soon-to-be brother-in-law.

After getting a call from his brother Christian, Jake must help prove him innocent in a shady murder case. Meanwhile health issues creep up on Mal and Des along with Tinny take on a case by themselves.

A new case gets Jake and Mal caught in the middle of a daylight-kidnapping gang, which they quickly discover is all just a game. The game takes a sinister turn when one of the players turns up dead, and it's up to the Doyle P.I. Agency to find the killer in a very real murder. Des practises his investigative skills by tailing Tinny and finds out some very disturbing information.

In order to find out where some stolen goods are, Jake gets himself arrested in order to be jailed with the thief who knows the location; Mal finds out some information about Rose that she's been keeping hidden from him.

It's no laughing matter when a comedian is being stalked, and the Doyles are on the case to find the stalker; Jake gets some inside info on Allison.

When a member of the Doyle clan is in danger from both the police and a killer, the family comes together to stay safe.

It's matrimony -- Doyle style -- as Jake and Mal are tasked with finding the person responsible for sabotaging an upcoming wedding; Mal and Rose fix a bump in the road in their relationship as Jake and Allison hit a stride in theirs; Des comes to Tinny's rescue but ends up exploding her plans in the process.

When an old Doyle family friend accidentally goes missing at sea, the Doyles are hired by his daughter to find out what really happened; Jake is forced to bail out Christian and picks up another line of business and a pile of new debt.

Jake and Mal are called to check into some death threats that have been made to a respected psychiatrist; an old "friend" from the past shows up and makes an interesting proposition to the Doyles; after Leslie's close call, Jake and Leslie find themselves struggling a little in their new romantic relationships.

The Doyles reluctantly take on a case from a dodgy "old friend" when he promises them a big payday; Jake and Allison encounter friction when their professional lives impose on their personal relationship; Jake gets an interesting job offer from an unlikely source.

When Des finds himself in a very bizarre and compromising position, the Doyle clan works overtime to get him off the hook; Jake meets someone who has been complicating Allison's life; Tinny and Des start coming to terms with their feelings for each other.

Crime novelist Garrison Steele returns again to both hire and torment Jake to help him research a murder case; Jake and Leslie struggle to keep their mutual affection for each other in check; Allison receives some much-needed help from Jake.

Jake buys an expensive gift for Allison only to have it stolen by a thief; The Mayor finds himself in a compromising position and asks for Jake's help and his silence; Mal has trouble telling a lie to his kids; Leslie thinks she's being followed.

The Doyles are hired by a real estate agent to investigate a series of strange occurrences at the site of her controversial housing development; Leslie uncovers some suspicious facts about the Mayor; the tension between Jake and the Mayor hits a high point; Allison makes Jake a serious proposition.

When Tinny and Des are snatched from the safety of the Doyle home in broad daylight, Jake is forced to confront a dangerous man from his past (Paul Gross) to get them back; Leslie loses something else very precious to her; Jake makes a decision about his future with Allison.

Sergeant Jake Doyle is assigned to protect a mob informant but when a mysterious group of men impede him, Jake finds the tables turned - himself the target of a manhunt.

Jake and Mal investigate a hit-and-run and encounter a slippery criminal couple; Rose has a run-in with familiar ghosts from her past; Des discovers that Tinny's trip to London didn't go as expected. Guest star: Shannon Tweed

The Doyles are hired to recover a missing item belonging to a beautiful client; Nikki asks Jake a favour he wants nothing to do with; Tinny enlists Des in keeping a secret.

Novelist Garrison Steele returns, hiring the Doyles to track down the love of his life. On the homefront, the Doyles get a new houseguest who's not planning on leaving any time soon. Jake dodges his ex-wife Nikki while wooing his ex-girlfriend Leslie - who'll have none of it.

It's a trip down memory lane as the Doyles investigate the murder of an old client. But when the body count rises, Jake starts to question the whole case. Rose gets in hot water with the police and Des's budding romance with med student Chandra begins to rub Tinny the wrong way.

Jake and Leslie find themselves trapped while trying to stop a robbery in progress; When Mal discovers his son is missing, he and Des try to locate Jake before it's too late; Rose helps newly-returned Doyle daughter, Kathleen, with a problem from her past.

Jake Doyle is forced to help his high school nemesis track down missing money and win back the heart of his estranged wife; Des must decide between Chandra and Tinny once and for all; Rose and Kathleen take a step forward in their friendship.

Stuck in Her Majesty's Penitentiary, Jake's only chance of freedom lies in the capture of a wanted kidnapper; Mal and Rose investigate a case that hits close to home; Walter helps Kathleen with a parenting issue.

With the infamous Maurice Becker back in town, Jake Doyle must get to the bottom of Maurice's fabrications before he disappears again; a Quebec cop makes Leslie think twice about her single status; Des attempts to rebound after his break-up with Chandra.

As one member of a biased jury, Jake struggles to exonerate an innocent woman; Des uses his skills to assist Jake's investigation on the outside; A decision from Kathleen’s past puts the Doyles in danger.

When Des's dad is kidnapped after being released from jail, the Doyles must band together and save Jody Redmond before it's too late; Mal is distracted when he gets bad news about his old partner; Kathleen angers Tinny when she chooses an issue from the past over a case from the present.

Jake is hired to retrieve a priceless violin from a familiar con artist; Mal continues to dig into the death of his former partner; Kathleen is roped into another of George’s schemes.

The Doyles struggle to prove Mal's innocence when he's accused of murder, but end up digging a deeper hole; Kathleen gets some brotherly help with the George situation; Tinny discovers the identity of her father.

The extended Doyle family shows up on the doorstep unannounced and in huge trouble, leaving Jake and Mal to tangle with some formidable gangsters from across the pond.

Jake and Mal are given no choice but to help an escaped convict prove his innocence, and they get a glimpse of the drug trade in the city in the bargain. Tinny's curiosity about her father grows. Jake finds out why Leslie's been off the radar.

Jake and Mal are hired by a man to find his wife, who he claims is alive and well despite being reported dead for years; Tinny takes her investigation into Crocker a step further; Leslie embraces Jake as a confidante.

After a ransom drop goes bad, Jake and Mal fight against the clock and an unpredictable man to find the location of a kidnapped girl; Tinny shares some shocking news; Leslie slips deeper into her risky assignment.

Jake's worst fears are realized upon discovery that Leslie has gone missing while working her dangerous undercover assignment, and now he's determined to find her at all costs. Meanwhile, an unlikely and suspicious client enlists Des's PI services.

The Doyles are hot on the trail of an international art thief; Constable Hayward makes a grave mistake with career-impacting implications; Leslie struggles as she deals with an important family issue.

Jake rushes to Leslie's side when the death of her father takes them to her hometown of Brigus, where a time of mourning turns into a full-fledged Doyle-style investigation when the death is ruled suspicious; Crocker formulates a plot to keep from being transferred to Vancouver.

Jake finds himself juggling multiple cases while looking into attempts made on the life of his ex-girlfriend; Tinny's relationship with her Uncle Jake is becoming strained due to her budding relationship with her father.

When Jake is kidnapped and nearly burned alive, he escapes and teams up with Mal to track down his would-be killers and make sense of the whispers that a mysterious "boss" is behind the plot; Monica builds a case against Jake and ropes Tinny into it.

Mal and Rose try to keep an old friend safe and find out what kind of business he’s really into. Jake is laid up with a bad injury and his medication causes some strange dreams.

When a crazed bomber takes over the police station, it's up to Jake to try and diffuse the situation from the inside before the hostage crisis can turn fatal; Trapped outside, Leslie leads the RNC command post with Jake's life hanging in the balance.

The city is thrown into chaos when a prison break floods the streets with escaped cons, and a threat against Tinny makes it extremely personal for Jake; Unfazed by the warnings from her uncle and grandfather, Tinny oversees a police transport of seized guns and drugs.

With Tinny abducted at gunpoint by Maurice Becker, Jake and Crocker have no choice but to work together to get her back. While being held captive, Tinny attempts to get into Becker's head.

Jake's location is uncovered in the Season 5 premiere. Later, Tinny oversteps her bounds.

An old nemesis interferes as Jake pursues a criminal.

Jake and Mal chase after a mysterious and troublesome woman.

Jake and Mal contend with a hit man.

The Doyles investigate an unusual murder that resembles the work of an eccentric novelist.

Sloan goes missing and Patti seeks Jake's help in finding her, but he has trouble remembering what happened the night before. Meanwhile, Mal and Des get tangled up with a dangerous thug; and Jake and Leslie make a decision regarding their future.

Jake stumbles upon a murder in the woods during a fishing trip with Mal and Des.

Jake is taken hostage during a robbery.

Leslie's informant is murdered.

Jake crosses paths with a hot-headed cop.

Jake pursues an art thief; Sloan struggles to find her place.

Jake tracks down a hustler; Leslie becomes suspicious of a fellow officer.

Jake is forced to team up with a former partner; Leslie must step up when a colleague is attacked.

Jake crosses paths with cop Bill Murdoch (Yannick Bisson) on a strange case.

Jake faces the consequences of his actions; Sloan makes an important decision about her future.

Jake must solve a case while facing the facts about Leslie; the Doyle's try to adjust.

Jake traces a sketchy money trail; Leslie faces some conditions upon her return to work.

Leslie resists meeting with the therapist; Mal and Jake keep a secret from Rose.

Leslie offers to help Jake and the Doyles.

Jake searches for evidence to prove his innocence; Mal and Rose question Doyle's return.

Jake must solve a puzzling case; Ned Bishop jeopardizes an important day; Leslie's past actions come back to haunt her.

The Doyles work with Jimmy and Wolf to protect a witness; Jake and Saul face off again; Rose discovers something about Sloan's past; Jake gets shocking news.

The Doyle's try to keep their stories straight during a police interrogation; Leslie and Jake keep secrets; Des and Tinny disagree on their relationship.

Jake's murder charge takes center stage; Leslie's job is on the line; Des is in the wrong place at the wrong time; Tinny is torn between her family and her job; the Doyle's have just 48 hours to solve a case.

Jake and Leslie fight for their lives; the Doyle's get help from an unexpected ally, but they must find evidence to clear Jake of murder.