Jonas must recover a chip containing information that could prevent a possible terrorist attack.

Mack, Charles and Jonas are assigned to protect an American musician while she tours the army camps in Iraq, while Bob is assigned to transfer a prisoner from a high-security prison.

The Unit is in Lebanon when Charles is seriously wounded. They must think and act quickly to save his life.

On the Home Front, Tiffy's problems continue to build when a man attempts to tow her car. The women stand up and fight to protect her.

Jonas goes on a solo mission, enlisting the help of some local militants to hunt down a terrorist known as "The Butcher". Charles is still recovering in the hospital, Mack takes on the task of arranging Hector's final funeral preparations, with the help of the other wives and Bob has been ordered to deal with the rescued journalist. Ryan must deal with the man sent by Washington to oversee the cover story.

Charles goes undercover among gang members from his old neighborhood when it's discovered that they've been stealing explosives and weapons. Meanwhile, Tiffy gets hurt at work and Mack goes after her attackers.

In Montenegro, Bob has a moral dilemma when he disagrees with the team's mission.

Tiffy discovers some information about Molly's past and decides to look into it further.

A Russian scientist and an Britsh MI5 agent are suspected of collusion. Jonas is sent to London to team up with the agent. However, things get complicated as Jonas had been engaged to the agent's wife earlier.