Susie Sparrow already had enough on her plate dealing with the standard horrors of high school: brutal exams, fragile friendships, and trying not to tank dinner with her parents. But her teenage drama takes a sharp turn into the supernatural when she inadvertently merges with Ferapont?an ancient, intense celestial being who claims to be an angel.

Suddenly, Susie is drafted into a secret war to rid the world of the demon-possessed.

It turns out that hunting hellspawn is a lot harder when you have to schedule your apocalyptic showdowns around a rigid high school class bell. Trying to maintain a normal social life while hiding a pair of giant, glowing, flaming wings is a logistical nightmare. Between keeping her grades up, keeping her secret from her friends, and keeping humanity safe, Susie is stretched to her absolute limit.