The well-known novelist's first children's book is a gently subversive fable celebrating the rewards of disorder. Princess Molly the Messy is deplored by her family: King Clement the Clean, Queen Nellie the Neat, and Prince Thomas the Tidy. Molly's domain is the castle tower, where she keeps the floor comfortably festooned with clothes and the bed is "lumpy and knobby with half-finished books." Her parents are not pleased, but Molly is vindicated when a flood drives the whole family up to her room, where they find dry clothes and leftover food lying everywhere and a cozy bed to share while Molly reads aloud. When the waters recede, she even helps them tidy up downstairs. Without condescension, Tyler presents a child's-eye view of glorious muss in a witty, economical narrative, while—in a fine picture-book debut—Modarressi (Tyler's daughter) details the disarray in angular forms and flat, carefully structured compositions, with expressive, delicately modeled faces adding a subtler dimension to Tyler's message. Good fun. (Picture book. 4-8)