Grade 2-4-- An amusement park is the setting for this addition to a popular series. After spending time on the various rides, Cam, her Aunt Katie, Uncle George, and friend Eric decide to eat at the snack bar. That's when Aunt Katie notices that her wallet is missing, and the mystery unfolds. With the help of her photographic memory, Cam begins to gather and eliminate clues; before long, the guilty party is rounded up (at the haunted house, of course). The story flows logically and convincingly from problem to solution, with a few twists that add just the right amount of suspense for this audience. Cam is once again portrayed as a strong character, making this another worthy transitional chapter book. The format is open and inviting, and humorous black-and-white drawings appear on every other page.