Description 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.
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..
Hot on the heels of this, another swimmer turns up drowned.
No sooner have DI Sarah Gilchrist and DS Bellamy Heap spoken to Alison, one of her colleagues suffers a heart attack - despite being in good health - during a long-distance, open-water swim.
When the lead campaigner is discovered dead, partially drowned and stabbed repeatedly, suspicion falls upon Alison.
Description 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
