A missing sibling. A targeted witness. A K-9 on the case.

K-9 officer Jackson Locke’s sister has vanished — and the key to finding her lies with Amy Scout…his sister’s best friend and his old crush. But when Amy comes under attack, two things become clear: Jackson’s sister has been investigating cold cases and someone wants Amy dead. Now he must untangle the mystery between the cold cases and his sister’s disappearance while guarding Amy from an enemy willing to kill to hide the truth…