When a truck driver is killed and a haul of fertilizer stolen, Malik and Skerritt fear a possible terrorist attack. The race is on to find the men responsible. Is this event connected with the car bomb that killed Agent Angleton? Malik knows he must do everything in his power to stop another catastrophe, including using his connections in the Muslim community and putting his life on the line.

The sophisticated holdup of an armored vehicle leaves four dead. One of them is an armed robber, with an enigmatic identity, leaving Major Crime to ponder the possibilities. Is this an ordinary bunch of thieves looking to get rich quick, or is there a more sinister motivation behind the robbery?

A Somali teenager is found viciously bashed to death in a lonely railway tunnel. The investigation leads Koa and Malik to a Somali man who is rumored to be recruiting Somalis to return to Africa to fight for Al-Shabaab. Meanwhile, Internal Affairs investigates the shooting of Mahmoud, an accessory in the armed robbery, which causes conflict between Malik and Travis.