"A contemporary Buffy" - Publishers Weekly

Every other day, Kali D'Angelo is an average teenager. She goes to public high school. She attends pep rallies (reluctantly). She's human.

And every other day in between... she's not.

Though she's not quite sure what she is on those days, Kali knows what she does... she hunts, traps, and kills demons, hellhounds, and other supernatural creatures that threaten her world. On those days, she is practically indestructible.
But when Kali notices a mark on a popular girl at school, she knows instantly that the girl is marked for death by one of these unworldly beings. And she knows she has only twenty-four hours to save her.

There's only one problem... it's the wrong twenty-four hours.

An action-packed supernatural mystery from Jennifer Lynn Barnes, no.1 New York Times bestselling author of The Inheritance Games.