D.S. Greig and D.C. Woods investigate the mysterious collapse of an old lady who has been burgled.

George is chasing a suspect but loses him. Steve searches the area and spots him. When caught he has just dropped some LSD tabs. The suspect tries to do a deal with the D.I. about getting bail to attend his brother's wedding. Regional Crime Squad:Drugs are in the station and organising a raid on the factory. Meadows gets upset because of a missing witness and Meadows wants the D.I. to go and talk to the witness. The D.I. wants to be in on the drug raid. Haines talks to the very scared witness. Haines is head hunted back to the drug squad. Meadows is not happy when told by Brownlow.

Greig uncovers a crime of passion. Morgan goes after a man handling stolen car parts.

Monroe leads an operation into cracking down on prostitution in the borough. Ackland and Jarvis tackle kerb crawlers, while Quinnan goes undercover as a prostitute's punter in an attempt to gather evidence on the madam of a brothel. However, Boyden suspects that Quinnan may have overstepped the mark and taken a shine to the girl when he tries to protect her from his angry line of questioning during interview.

Garfield finds a young girl who has suffered from an overdose, but upon arrival at the hospital, discovers she is the third victim of a spate of recent victims. When he finds a fourth boy dead, Haines, now with the Drugs Squad, returns to Sun Hill to help Meadows track down the uncut consignment of heroin brought in from the Far East. Stamp and Quinnan discover a link to a burglary they investigated earlier in the day.

Woods investigates the assault of a young woman, who is reluctant to reveal the identity of her assailant. Meanwhile, Greig and Croft investigate the burglary of an electrical store and discover the two incidents are connected. With evidence from another witness secured, Woods attempts to use the girl to set a trap to catch her boyfriend – a big-time villain – during a visit to Sun Hill.