
Booklist recommends the book for grades 5-8.
Mrs. Wilson Says: I really liked the logic puzzle here. If a boy goes into an enclosed pod at the bottom of a ferris wheel, how in the world could he disappear from the pod while it went around the wheel? Without ANYONE noticing? Great detective story. Also: when you read this, you'll want to smile at Ted so he knows you're his friend. Just go with me on this.
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More books to test your logic: Chasing Vermeer by Blue Balliet and The Mysterious Benedict Society by Trenton Lee Stewart.