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.