A body found stabbed repeatedly outside the local lido leads DI Sarah Gilchrist and DS Bellamy Heap into an intriguing new case. With the local lido under threat of closure by ruthless businesswoman Alison Sutherland, the Save the Salthaven Lido campaigners are fighting a desperate battle to keep it open. When the lead campaigner is discovered dead, partially drowned and stabbed repeatedly, suspicion falls upon Alison. ...