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.

Inspector Wright becomes personally involved in a case when a young woman is found raped and murdered after getting into a taxi. The suspect is the same man who had previously walked on a similar charge, and now Wright sees an opportunity to put the man away for a long time. Meanwhile, Malik works to find the gang responsible for the armed robbery.