A body found stabbed repeatedly outside the local lido leads DI Sarah Gilchrist and DS Bellamy Heap into an intriguing new case.

With an art deco lido under threat of closure by a ruthless property developer, the Save Salthaven Lido campaigners are fighting a desperate battle to keep it open. When the lead campaigner is discovered dead, suspicion falls on the developers.

No sooner have DI Sarah Gilchrist and DS Bellamy Heap begun to investigate that there is a second death during a pre-qualifying event in Brighton Bay for potential Cross-Channel swimmers. This time it's a local millionaire businesswoman with radical plans to reorganise the family business.

When another endurance swimmer dies during an event with links to the property developer, Gilchrist and Heap flounder. Are all the deaths connected to the Salthaven development? Is someone targeting open-water swimmers? Gilchrist and Heap race to uncover the truth before more victims come to the surface.