A cold case solved by the K-9 unit… but the past is not so easily escaped. Decades after her parents’ murders, Penelope McGregor’s grateful the killer’s finally been identified—until he comes after her. Now Detective Tyler Walker and his K-9 partner, Dusty, must protect Penelope and catch the culprit…while making sure his little girl stays out of the crosshairs. But can the single father outplay a killer whose endgame will leave no one safe?