Two years to the day after Roxy Silva's husband was murdered, a freak sinkhole drains a retention pond, exposing the car used in his fatal hit and run. The skeleton of the presumed prime suspect, the car's owner, is found inside the trunk, thrusting the investigation in a new direction.

Detective Kyle Ransom is determined to find his best friend's killer, and Roxy is equally determined to help. As a mail carrier, she can remain invisible as she moves around town. Using her total recall memory, she observes activities and captures images of people, vehicles and license plates, as well as the addresses on mail and packages she delivers. Roxy has no idea her amateur sleuthing will place her life in danger.

Together, Roxy and Kyle uncover a shocking trail of deception and secrets. As they work on the cold case, their relationship heats up. Kyle's wife died years ago, and he's ready for a commitment. But Roxy is recovering from the depression triggered by her husband's murder and other sudden and tragic losses in her life. She's struggling with a deep-seated fear of loss, her faith, and finding meaning in a chaotic world. Complications arise when Roxy's first love comes back into her life, wanting a second chance. Old feelings of attraction and bitterness surface, as she confronts a long-buried secret in her own past.

Kyle identifies a new prime suspect, and the killer drops out of sight. When Roxy leaves on a 'wilderness women getaway' camping trip with her wisecracking friends, she finds herself in danger as the killer stalks her. She returns home, and the killer follows. Roxy is plunged in a fight for her life when she's taken captive, and she must use her wits to survive.