Three years after her mother's suspicious death, forensic artist Jo Cattrel is in hiding, working at a storm-watching lodge along the Washington coast. When her father sends her a disturbing and cryptic message, Jo leaves the safety of the lodge to find him. But during the ferry crossing, Jo witnesses a murder—and becomes a target.

More surprising to Jo than being in danger is the identity of the person who steps in to protect her—none other than her ex, former Green Beret Cole Mercer. Now a private investigator, Cole has been looking into her mother's death. If he can just uncover the truth, maybe Jo can end her self-imposed captivity and the two of them can pick up the pieces and build a future together.

As Cole and Jo search for answers, the past rushes in like a dangerous tide before the truth can be revealed.