A Somali teenager is found viciously bashed to death in a lonely railway tunnel. The investigation leads Koa and Malik to a Somali man, Asad, who is rumoured to be recruiting Somalis to return to Africa to fight for Al-Shabaab.

The dead boy opposed Asad’s teachings and his guardian, Samiira, is suspicious of this charismatic man. Worse, he holds great sway over her younger brother, Yusef. Despite Malik’s efforts, it seems the violence Samiira fled in Africa has followed her, with tragic consequences. But has the war in Somalia had repercussions here in Australia, or is the killing a result of racial conflicts?

Meanwhile, Internal Affairs investigate the shooting of Mahmoud, an accessory in the armed robbery, which causes conflict between Malik and Travis. Malik fears a vital link to the identity of the gang was extinguished with Mahmoud. He blames Travis. But is Malik’s vision clouded by grief?

Khalid, the dead bank robber, is found to have a wife, Sally Wilson, on active duty in Afghanistan. What has Afghanistan got to do with an armed robbery in Sydney? But the detectives’ new leads end up in the morgue.

The investigation is constantly thwarted by the strategies of a clever, ruthless gang. But who are they? Who is running the show?

The mysterious double murder of a Jewish couple leaves few leads. According to the woman’s son, David, a large amount of cash is missing, along with the student who was living with them, a Palestinian.

Detective Travis is surprised. What’s a Palestinian doing in a Jewish household? Malik locates the missing Palestinian student, who is hiding something. Guilt, or is he just defensive, born out of experiences back home? But the Palestinian is not the only one hiding things. The woman’s son is lying about critical evidence. The conflict between the two detectives, Travis and Malik, spreads from the Middle East to the unsolved crimes of multiple murder and armed robbery.

Two drug importers, Yasser and Rizk, are in the morgue. Shot at close quarters, next to the container of heroin they had imported from Afghanistan. Who killed them and why? Is the importation of heroin linked to the armed robbery, or something completely separate?

Evidence leads the cops to ex navy diver, Ryan Hunter. But why would a diving instructor knock a couple of Arab drug importers? What they discover changes the direction of the investigation into the armed robbery and subsequent murders.