Simone Clark sets her sights on joining Matthew Garza's newly formed special unit as they investigate the murder of a federal engineer; Simone and Cutty's relationship is tested as their opposing opinions about law enforcement come to a head.

Simone utilises her informant to track down an arms dealer on the FBI's Most Wanted list; Brendon investigates a risky lead on a congressman; Cutty and Simone struggle to see eye-to-eye.

Garza's unit gets roped into a complicated kidnapping case involving a forbidden relationship between two rival drug-dealing gangs; Simone's love life is heating up; Laura comes face-to-face with her past; Carter tries to reconnect with his wife.

When the team splits up to question a suspect's father, Simone and Laura discover critical information on how an abusive relationship is connected to the crimes. Sparks fly with Laura and her former colleague as they debate the killer's motive.

Simone and Carter get trapped in the tropics while hunting down a suspect on the run; Simone's unexpected meet-cute with Dina throws a wrench into Cutty's love life; Elena's high-end fashion splurge cracks open an unsolved murder mystery.

When Simone and Carter go under cover to find an international assassin known as The Reaper, a prisoner seeking bail recognises Carter and nearly blows his cover; Laura and Brendon trace a lead on The Reaper's assault rifle.