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When cops break the rules, there's only one detective you can trust to investigate.Florida homicide detective Maggie Novak should be celebrating: it's the start of a new year, and her boyfriend has just proposed. But all she can think about is the alarming news she received earlier that evening--her teammate Detective Clayton Young is missing.With few leads, Maggie heads to the supermarket where Clay was last seen. To her horror, security footage reveals a devastating scene in the parking lot: her colleague has died in fearful circumstances. As the investigation begins, Homicide Squad is rocked by the news that Clay might not be the only intended target, and that any one of them could be next on the killer's agenda.Clay's partner, Detective Andy Stucker, is refusing to answer calls, and Maggie suspects he has a part to play in their colleague's death. Scanning through Clay's phone, she finds a message to Stucker with the words "they know."Who are "they"? And what do they know? As more secrets come to light, Maggie has good reason to believe the killer is just getting started. She needs to uncover the truth fast. But is it already right in front of her eyes?