The Majors raid the flat of a prime suspect for the aggravated burglaries and his terrified girlfriend jumps out a second storey window. Peter and the Majors go into shock while the suspect, Garry, slips through the net. The new Chief Superintendent of Crime, Jock Brennan, arrives with the Internal Investigations Department while the Majors desperately search for their missing suspect. When finally tracked down Garry is armed and has a young woman and her son as hostages. Peter Faithful frees the boy but becomes a hostage himself. The siege is on! Peter and Moon, who eventually diffuse this dangerous situation, now have to face the intense scrutiny of Internal Investigations. The future of the squad looks bleak.