After a bent detective is discovered on the force, the UCOS team is tasked with investigating his only unsolved case. In 1998, assistant brewer Graham Thompson was found drowned in a vat of beer at Felspar Breweries. The dead man's girlfriend has always maintained that it wasn't an accident. Everyone concerned, including Sir Freddie Felspar ,says he was a brilliant brewer and a great loss. The original investigator failed to interview either of Sir Freddie's children and son Julian is now the company's Chief Executive. The brewery had won the gold medal for its beer 5 years running but in 1998 they lost to a small brewery that made its reputation on the win. The team now wonder if industrial sabotage may be at the root of the mystery. Meanwhile, Sandra continues to investigate her late father's activities while he was on the job.

Thirty-three years after the corpse of Dr. Simon Lockhart was found in his butcher's shop at Smithfield the body of Harry Eldridge is discovered - cut into pieces. The doctor used to gamble with Harry and other butchers - now all retired - and Jack discovers from the Lestade brothers, butchers who are Gerry's cousins, that Gerry and other butchers were in the financial clutches of gangster Danny Paye, now in a care home. Brian learns that the doctor performed illegal abortions - anathema to strict Catholic Eldridge - but Sandra gets the biggest shock on finding that she has an illegitimate half-brother, who was adopted by Eldridge's widow, Julia. Unfortunately his DNA is all over Harry's corpse.