Four months after their separation, marketing consultant Lake Warren faces a tough legal battle with her husband, Jack, for custody of their two kids. Though the timing couldn't be worse, she finds herself responding to the flirtations of Dr. Mark Keaton, her handsome colleague at the Advanced Fertility Center. But the morning after their one-night stand, Lake discovers Keaton with his throat slashed. Afraid of losing her children forever, Lake lies to the police—and begins searching for the truth on her own before she can be charged with the heinous crime. She starts getting hostile treatment from her coworkers, and strange clues start appearing, quite literally, on her doorstep. Soon Lake is pulled dangerously close to the very dark secrets surrounding the slain man and the clinic where they worked. And suddenly the police are not the only ones hunting Lake Warren.