Wealthy Dublin businessman Victor Delahaye invites Davey Clancy, the 25-year-old son of his business partner, out on his sailboat. Victor then proceeds to shoot himself in the chest. Soon afterward Delahaye's business partner Jack Clancy, who was secretly manueuvering to take over the company, is found dead in suspicious circumstances.
Detective Inspector Hackett and his friend, pathologist Dr. Quirke, look into both cases. Plenty of persons of interest turn up: Victor's beautiful, flirtatious, manipulative wife Mona; his handsome, hard-partying, adult twin sons Jonas and James; his quiet, self-effacing sister Maggie; and Jack Clancy's wife Sylvia who has had to put up with her husband's constant womanizing.
The book is as much a character study as a mystery and at times I wanted the interactions among the characters to move along faster. The resolution of the mystery probably won't come as a total surprise but it's an entertaining book.