52 books • 7 series
Uncle Shawn and Bill and the Great Big Purple Underwater Underpants Adventure (Uncle Shawn)
Uncle Shawn and Bill and the Pajimminy-Crimminy Unusual Adventure (Uncle Shawn and Bill, #2) (Uncle Shawn)
Uncle Shawn and Bill and the Almost Entirely Unplanned Adventure (Uncle Shawn and Bill, #1) (Uncle Shawn)