June and Cass are called to the flat of a prostitute named Allie after tracing malicious calls made from her phone, only to find her lying unconscious on the floor from a vicious assault. Turning her over reveals the words 'Join The Club' written on her back. The case matches several other recent assaults on prostitutes in the area, most of whom are being pimped by Robert Stern. After being apprehended it is revealed that Stern attacked Allie but was not responsible for the calls she made or the writing on her back. Meanwhile June saves Beth, another of the victims, from throwing herself under a train believing herself to be HIV positive after her attacker revealed this to be the words sinister meaning. When he is eventually caught and brought back to the station, Liz identifies him as ex-boyfriend Andy Marshall, a search of his houseboat turns up HIV medication. The calls were being made to his wife Julia Marshall who is pregnant and living on her own, unaware of his supposed HIV stat

The sustained abuse towards schoolteacher Sonia Graham runs into overdrive when she is found in her flat, having been shot through the chest, and the list of suspects soon begins to mount. Glaze struggles to get Prince's brother Nathan back on side after harsh mishandlings by Webb, so Webb decides to trail him to see if he leads him to the top prize - and soon enough, his suspicions are proved to be correct. Young finally manages to get young rape victim Louanna to open up about her ordeal, and subsequently, members of the Bevan Park crew are arrested on suspicion. On the way to respond to an urgent call for assistance, Hollis notices Boyden pulled over at the roadside in a clinch with Abi Nixon.

PC Gary Best is smitten by the arrival of new PC Honey Harman, whose manner and appearance lead Sgt. Matt Boyden to conclude that she's a bit of an airhead. Searching the school for the gun used in the gymnasium shooting and the shooting of teacher Sonia Graham, PC Reg Hollis stumbles upon Boyden in an embrace with DI Nixon's 15-year-old daughter. Sgt. June Ackland recommends Reg inform the Superintendant, which he does. Boyden is furious, but not as furious as DI Nixon when she finds out that her colleague has taken advantage of her underage daughter. Insp. Gina Gold and PC Luke Ashton are concerned that PC Kerry Young is back at work too soon after her miscarriage, but Kerry's considerable persuasive skills come into play when rape witness Beth Tyler is threatened on the estate and refuses to testify. Best and Harman follow some robbery suspects on foot patrol, but when this leads them to the gun and the student who murdered Sonia Graham, Best is taken hostage. Harman uses her judo s