Dwarf Chinese porn stars? An ex-con hunting guide who accidentally bumps off his clients and friends? These are just a few of the offbeat characters who populate Flat Crazy (St. Martin’s Minotaur), the third and cleverest installment of Austinite Ben Rehder ’s Blanco County Mystery series. His caper recipe is tried-and-true: Start with a preposterous situation (in this case, an undocumented Mexican worker allegedly attacked by the mythical chupacabra), stir in a square-jawed authority figure (studly game warden John Marlin trying to unravel a series of mysterious deaths), and season with a spicy mix of corpses, witless buffoons, and unwitting bystanders. Rehder displays real affinity for his Texas Hill Country setting, and he imbues the place with a unique sense of place. Flat Crazy is pure, guilt-free pleasure for those who like their mysteries with a side order of weird.