Digging up past secrets puts a K-9 team in the line of fire. During an investigation into a series of homicides, FBI agent Finn McDaniel is unexpectedly attacked, and a blow to the head leaves him with amnesia. Left for dead, he's discovered by cadaver dog Cipher and her handler, search and rescue specialist Jordyn Williams--who is also Finn's missing sister's best friend. As Finn and Jordyn work to recover his crucial memories, they unearth evidence that links his sister's disappearance to the killings. When the body of the latest victim is found, can they stop the murderer from striking again...or will their pursuit place them directly in the enemy's crosshairs?