Still reeling from the trauma of a previous case a year ago, the now-retired Harry Ambrose travels to Hanover Island in northern Maine for a recuperative getaway with his partner, Sonya. When an unexpected tragedy occurs involving the daughter of a prominent island family, Ambrose is recruited to help the investigation, only to be thrown into a mystery of mounting paranoia that will turn this sleepy tourist island, and Ambrose's life, upside down.

The third installment follows Detective Harry Ambrose as he begins a routine investigation of a tragic car accident on the outskirts of Dorchester in upstate New York. What Ambrose later uncovers is a hidden crime that pulls him into the most dangerous and disturbing case of his career.

In the wake of the investigation, Jamie, an upstanding Dorchester resident and expectant father involved in the accident, looks to Ambrose for support. When Jamie's old college friend, Nick begins to insert himself into the case, it becomes clear there's more to the tragedy than meets the eye.

Detective Harry Ambrose is lured back to his hometown in rural New York to assess an unsettling and heart wrenching crime -- parents murdered by their 11-year-old son, with no apparent motive. As Ambrose realizes there's nothing ordinary about the boy or where he came from, the investigation pulls him into the hidden darkness of his hometown. He's pitted against those who'll stop at nothing to protect its secrets -- and a mysterious woman who proves to be a complicated, enigmatic piece to this haunting puzzle.