Barbara Wilson"s mysteries are witty, fast-paced, and fun to read. Plus, they have enough politics so that you can tell yourself that reading them is good for you. Gaudi Afternoon, written before "gender studies" became a buzz phrase, looks and laughs at what makes a gal straight or queer, femme or butch, lesbian or dyke, transgendered or translated. Cassandra Reilly, Wilson"s wry, savvy, globetrotting sleuth, charges through Barcelona to find a missing person or two of indeterminate gender.