Dead Simple by Peter James

It was meant to be a harmless stag night prank. A few hours later four of his best friends are dead and Michael Harrison has disappeared. With only three days to the wedding, Detective Superintendent Grace - a man haunted by the shadow of his own missing wife - is contacted by Michael’s beautiful, distraught fiancée, Ashley Harper. Grace discovers that the one man who ought to know Michael Harrison’s whereabouts is saying nothing. But then he has a lot to gain - more than anyone realizes. For one man’s disaster is another man’s fortune... Dead simple...
‘James has got the gift for turning mind-stretching subjects into novels that are irresistibly readable as well as utterly believable’ Robert Goddard
‘A brilliant idea, superbly crafted. A terrific page-turner’ James Herbert
‘A page-turner of a book with some terrifying twists... a very satisfying read’ George Baker, Inspector Wexford