When Cammie Morgan arrives at her friend Macey's five-star hotel for the Democratic National Convention, where Macey's father is about to receive the vice presidential nomination, she thinks she's in for an exciting end to her summer break. But if you're a Gallagher Girl, 'exciting' and 'deadly' are never far apart.

Cammie Morgan wakes up in an alpine convent and realizes that she has no memory of the several months that have passed since she left Gallagher Academy to protect her friends and family from an ancient organization known as the Circle of Cavan.