Olive is distraught after the events of her first year attending Hogwarts. Just when she thought things were returning to normal, she is faced with having to choose between keeping the peace or supporting her past best friend, Sebastian Sallow, who's found a new lead in his desperate search for a cure for his cursed sister.

Primrose Callahan is recruited by the Ministry of Magic and given a time-turner with one job - stop a version of events that leads to a Wizarding War in 2020 by removing a Dark Wizard from the equation before they even have a chance to occur.