For Detective Carolyn Hall, the rules are simple: trust your partner, follow the evidence. Partnered with well-regarded Robert White, she works the streets of New Honan investigating its darkest corners. But one blood-soaked alley murder changes everything: the key witness is Rachel Fenimore, an ER nurse who called 911, then fled the scene. White recognizes her-she treated him years ago. Rachel denies involvement, then admits she was there, sleepwalking. As Hall investigates, the case spirals into something far stranger. Rachel claims she's on a list, that a killer is systematically targeting medical professionals. When Rachel makes bail, the danger intensifies-and so does Hall's need to protect her. Caught between her loyalty to her partner and her growing connection to a woman who might be guilty, Hall must sort truth from lies, paranoia from reality. Her search for answers takes her into dangerous territory-White's past, Rachel's present, and the blurred line between her badge and her heart. Hall's investigation will force her to betray someone. The only question is who.