Annie is injured pursuing a fugitive using explosives to get revenge and is forced to rely on Ben Crowley (Eddie Cibrian); Annie's absence forces Luke to step up to the plate.

A U.S. marshal impersonator kills people in a misguided attempt to capture fugitives; Luke gets a surprise visitor who threatens his relationship with the team.

A serial killer escapes prison and U.S. Marshal Annie Frost must rely on jailed fugitive Mason Boyle for answers. The case takes a twist when the U.S. Marshal team discovers that the fugitive's ultimate victim is not who she appears to be.

Jackson Cooper is a fugitive with a dark past who manipulates his teenage girlfriend with promises of freedom from her father and a life filled with romance and adventure. When his deadly rapsheet is revealed, Jackson flees with his underage victim, destroying anything and anyone that comes in his way. U.S. Marshal Annie Frost must confront her own family history to gain the trust of Jackson's girlfriend, in order to track them down before it is too late.

U.S. Marshals Annie Frost and Luke Watson pursue fugitive Chris Novack, who takes the city of Houston hostage after escaping from the county courthouse, in violent pursuit of his best friend and girlfriend who have betrayed him. Meanwhile, the day's events allow Luke to understand his place in the force and Jimmy Godfrey looks at girlfriend, Natalie, in a new light.