Norah Sullivan is going to die. Her father is on the verge of death. And their only hope for survival may lie in the archives of The Academy.

Norah Sullivan has just discovered she's a navigator: a person who can manipulate probability. The same day Norah's navigation manifests, she and her father are swarmed by possibility beasts. When a possibility beast bites you, your risk of death skyrockets. And pretty soon, her father gets sick.

Desperate to find a cure, Norah applies to the Academy of Navigation, where there are rumors of restricted information on beast bites hidden in research archives. Once on campus, Norah learns that only senior research assistants are allowed in the archives—and you can only become one by winning a team trial designed to push your navigation abilities to the brink.

She'll need to rely on her roommates, as well as her peer mentor, the handsome Vik Souza, to win the competition.

But trouble arises at every turn. There are tensions in the group, romantic complications, and unexplained student disappearances. As Norah gets deeper into the competition, she realizes not everything is as it seems, and the stakes are much higher than she ever could have imagined.