A routine murder investigation at a hotel becomes more complex when an unknown vehicle crashes Calleigh's Hummer into a body of water, compromising most of the evidence collected at the scene. It is revealed that the victim was an undercover agent in the Crypt Kings biker gang, working alongside another operative named Jake Berkeley, Calleigh's former Academy classmate and boyfriend. Further investigations into the gang reveal the murder weapon as a CornerShot device, and the gang's involvement in gunrunning.