Gerry Maddren. The Case of the Johannisberg Riesling (1988) 191 pp.
Publisher’s description: “Is there to be no peace for Jerry Cool? The poor guy can’t even visit the Carneros wine district north of San Francisco for the eccentric Stiver family’s promotional Grape Stomp without having a nice lady turn up dead. Bad PR, that! When a second corpse appears nearby, Jerry becomes the only likely suspect for both murders. Not to worry. Help is on the way. From North Beach to Polk Street to Pacific Heights, from Nob Hill to the Tenderloin, Jerry’s old pals rally round. Or could it be that ‘help’ is not always the intent?”
Hubin