Husband-and-wife mystery writers Bill Pronzini and Marcia Muller will appear for The Bee Book Club at 6 tonight at Borders Books, 2339 Fair Oaks Blvd., Sacramento; (916) 564-0168. Pronzini's "Schemers" (Forge, $24.95, 304 pages) and Muller's "Locked In" (Grand Central, $24.99, 288 pages) are the book club's choices for October. The pair will engage in a conversation with each other, then answer questions and autograph books.