Fenella Woods is less than excited when her brother James announces that he's coming to visit her. She's starting to feel truly settled in her new home on the Isle of Man, but James made it clear when she inherited their Aunt Mona's fortune that he didn't think it was fair. She can only hope that he's just coming for a visit and not for a fight about the estate.
When he arrives with a girlfriend Fenella knew nothing about in tow, she's even less excited about the three-week visit. But James's girlfriend, Stephanie, grew up on the island and she has her own reasons for wanting to be there. 
When Stephanie turns up dead, is it just an unfortunate accident or was someone unhappy to see the woman back on the island? Police Inspector Mark Hammersmith is on the case, and he's quick to consider James as a suspect.
When James recounts a story from Stephanie's past that sounds impossible, Mark seems inclined to discount it as fiction. When someone tries to kill James, though, Fenella is convinced that it's true.
Can she persuade Mark to see things her way? And can she keep her big brother safe from a killer who might just try again?