D.S. Roach, along with the Robbery Squad, are staking out a security van, but the robbers never show up. Roach and D.I. Burnside believe that the robbers were tipped off. Meanwhile, Det. Supt. Meadows and AMIP are at Sun Hill dealing with an ongoing murder enquiry. One of Meadows' team comes under suspicion for corruption. A team from MS15 is brought in to investigate.