Forty years ago, Sydney Hansen's best friend was murdered. His killer left her a menacing note. Now the man Syd suspected was behind the killing has died—and she receives another threat, attached to a photo of her thirteen-year-old great-niece. Terrified but angry, she turns to the NYPD and Detective Gale Sterling to reopen the case.

Gale has been handling cold cases for over a decade, burying herself in her work and caring for her elderly father, a former detective himself. But this case isn't like the others. Maybe it's Sydney Hansen—she finds her beauty captivating. Or maybe it's the bullet she takes for Syd one night when their date turns into an impromptu stakeout.

Syd and Gayle just want to protect the innocent and bring a killer to justice, but as their feelings for each other grow the once cold case turns dangerously hot.