Fourteen years ago, high school track star Sydney Adams was gunned down in Philadelphia's Fairmount Park. The investigation yielded useless clues, and the case went cold. But homicide detective Augustus Knox never gave up on finding Sydney's killer. Now, retired from the police force and with only months to live, he enlists the help of private investigator Jocelyn Rush to clear the case once and for all.

Armed with little more than a theory as to who murdered Sydney, Jocelyn tries to lure a killer into the open. But unraveling the mystery means facing off against a cunning psychopath whose ruthlessness knows no bounds. When more bodies start to pile up, Jocelyn has to decide just how far she's willing to go to catch a cold-blooded killer.