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.

When junior tennis champion Alice Kemp fell to her death from a balcony in 2010, it was assumed she killed herself as she had lost a crucial match but now a cleaner recalls hearing raised voices just before the death and the case is reopened. Alice's agent, Anthony Marshall, claims he lost a valuable client but admits Alice was considering a change of representation whilst Victoria, Alice's mother, tells the team that David, her estranged husband, a gambling addict, had visited Alice before the fatal match. He admits that he was betting against her for money and asked her to lose the march but denies any foul play. Fawn, the player who beat Alice and took her place as Number One, was nonetheless good friends with her and helps the team find the person responsible for Alice's death though Brian is less successful in trying to get his dog in with a model agency.