Floors

Carman (the Skeleton Creek series) delivers a madcap mystery reminiscent of Roald Dahl and Ellen Raskin, complete with bizarre inventions, a mystery involving a missing billionaire and his fortune, and even a crazy elevator or two. At New York City's Whippet Hotel, guests stay in rooms like the Pinball Machine%E2%80%94featuring giant flippers, bumpers, and pinballs%E2%80%94and the Central Park Room, an exact reproduction of the famed park. When Leo Fillmore, the 10-year-old son of the hotel's maintenance man and himself an assistant maintenance crew member, discovers a mysterious purple box while walking the hotel's ducks, he embarks on a mystery that has him sneaking into hidden rooms, evading a pesky six-year-old and other guests, and riding a train through a tunnel of fire. With the help of his friend Remi and a tiny, talkative robot named Blop, Leo discovers more boxes and more mysteries while trying to avoid running afoul of the hotel's shrewish manager, Ms. Sparks. Sparks, a one-note nemesis, is one of the book's rare sour notes, but Carman delivers so much fun that readers aren't likely to notice. Ages 9%E2%80%9312. (Sept.)