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While driving through the New Mexico Desert during a rainy night, college students Jim Halsey and his girlfriend Grace Andrews give a ride to a hitchhiker. While in their car, the stranger proves to be a psychopath threatening the young couple with a knife, but Jim successfully throws him out of the car. This sets off a chain of events that will change all of their lives forever.

Walker investigates a murder connected with a missing government weapon. In addition, he tries to track down a teen on the run from a crime syndicate.

A tight-knit team of FBI investigators, along with their District Attorney supervisor, is suddenly torn apart when they discover that one of their own teenage daughters has been brutally murdered.

Deputy Sheriff Joe "Deke" Deacon joins forces with Sgt. Jim Baxter to search for a serial killer who's terrorizing Los Angeles. As they track the culprit, Baxter is unaware that the investigation is dredging up echoes of Deke's past, uncovering disturbing secrets that could threaten more than his case.