A boy. A dagger. A secret. When Grace Bennet stumbles into a New York City time portal, she is transported to a warehouse fire in 1913 and barely escapes with her life. Rescued by the handsome time-traveler, Dante O'Rourke, she embraces the abilities she has tried to hide and enters the secret world of the Kairos, the protectorates of time. But the Kairos have enemies; evil, murderous enemies, and the Vagaries are determined to destroy the Kairos and all of their kind, including Grace. When the Vagaries threaten her family, Grace must face the biggest challenge of her life, and finish high school too.