This is the second time I have read this stand-alone Christie mystery. The two main characters, Bobby, a vicar's son and Frankie, the daughter of local peer, suspect that a death from the cliffs was deliberate and not an accident. They blithely look for clues without realizing they are arousing suspicions as they do so. I would love to see more of Frankie and Bobby, but I think this was the only book with this charming couple.