A woman approaches private investigator, Andy Flood, claiming that her controlling husband tried to drown her in the Gulf of Mexico while on holiday in Florida. Miraculously, she finds her way back to the UK, determined to exact revenge.Flood turns down the case, doubting her fanciful story but when something shocking happens to her, he feels compelled to investigate.Meanwhile, Flood's daughter is arrested on suspicion of murder, claiming self-defence. When similarities begin to appear in their stories, he faces a dilemma: having doubted the woman's claim, should he believe his daughter?