She is quickly identified as Katie Pine, a teenager who had disappeared months ago. At the time, Detective John Cardinal insisted that Katie was no ordinary runaway. His relentless pursuit and refusal to give up on the case, and his lack of results, got him demoted from Homicide. But now the police force wants Cardinal back on the case—with a new associate by his side, Lise Delorme. As these two untrusting partners gather evidence of a serial murder spree, a pair of sociopaths is closing in on the next victim.