Prologue:
Patricia brings Eddie and Alfie to the gatehouse, but the two escape. Fabian convinces KT that Patricia managed to turn them into sinners and they are now after KT ( KT is unaware that Mr. Sweet is a sinner, so she believes another sinner would have been needed). Fabian tricked KT that they should "spy" on a team evil meeting to better prepare themselves against any plans. She agrees, and around midnight, tey sneak out and "follow" Patricia to a meeting (Fabian arranged for Patricia to go to the gatehouse at that time to lure KT there). When they get to the gatehouse, KT finds that she has been tricked. She tries to escape, but is ambushed and becomes the last sinner. With all five sinners, Robert Frobisher-Smythe completes the ceremony to bring Ammit into the mortal world. KT, however, was not expressing a sin at her time of capture, only pretending to. Without KT's soul, the ceremony fails, releasing the other sinners from their capture. The school year almost over, world destruction avoided, Sibuna is convinced they are finally safe. But are they...?
