When narrator Frank Merson--a mild-mannered local newspaperman--gets socked by a total stranger while riding the Long Island Railroad, he's pretty sure the punch was meant for his notorious, womanizing twin brother Fred. But what about the subsequent break-and-entering job on Frank's apartment? Or the fact that art-gallery owner Fred seems to have run off with Dominique, his partner's wife? Some of the mystery is cleared up when Frank's assailant turns up dead. . . and turns out to be an angry Philadelphia art-collector whose painting had been stolen, and then sold by Fred to another collector! Eventually, however--after Frank has searched for Fred, wound up in bed with Dominique, been abducted by thugs, and done some sleuthing at an upstate museum--some family secrets and missing papers are shown to be at the center of the goings-on. Creaky plotting--but Frank's loose, cheerfully aggravated narration makes it all pretty palatable: another modest comedy-suspense pleaser from the author of The Marble Forest (1971) and many others.