London is infiltrated by an eerie alien and the team must battle to save Tanya.

When monsters invade Coal Hill, four students form an unlikely alliance to defeat them.

As April's connection to Corakinus strengthens, a sinister invasion begins.

A dreadful new monster threatens the school, and the gang must unite to fight against it.

April must confront Corakinus as the others try save the Earth from extinction.

Trapped in detention, dark truths emerge and fractures form in the friendship group.

Miss Quill embarks on a dangerous mission to impossible places.

Despite the rifts that have emerged since their time in detention, the friends must work together when their families are threatened by a foe they thought they had defeated.