Last Wednesday, the Book Passage in San Francisco hosted Andrew Shaffer (and an illustrious if stiff guest) on Shaffer's "Ridin' With Biden" Tour for Hope Never Dies, the first Obama Biden Mystery (Quirk Books). What Book Passage bookseller Cheryl McKeon called one of the most fun runups to the appearance included a card signed by many customers with birthday greetings to the former president, who turned 57 on August 4. Along for the ride (from l.): Nick Mitchell, Book Passage; Katherine Ralph, Book Passage; Sleuth-in-Chief; Andrew Shaffer; and Cheryl McKeon.