Joan has saved her family and reset the timeline. Now, Nick is just an ordinary boy and Aaron is again her enemy. But Joan must find a way to re-gather her old allies when the real threat returns - the woman who created Nick. Eleanor, the most dangerous member of the Monster Court.

As the stakes rise--and Nick gets perilously closer to discovering the truth of what Joan did to him--Joan advances deeper into the monster world. When she's captured by the Monster Court itself, she uncovers a secret of her own. She and Eleanor are the last members of a thirteenth monster family--a family erased from the timeline by the King. Eleanor has been fighting to restore them.

But when Joan glimpses the dark timeline their family once ruled over--and Nick's role in it --she finds herself once again torn between love and family and monstrous choices as she battles to prevent Eleanor from bringing back their family and ushering in a terrible future.