Nancy and her friends are on a class trip to the zoo. Everyone brought a camera and is excited because their teacher has announced a Best Photo contest. Whoever takes the best picture at the zoo wins a prize! The trip is going greatuntil a flowerbed outside the monkey cage is wrecked and Nancys class is blamed! The zookeeper is mad and says they might have to leave the zoo if someone doesnt come forward. Nancy is upset. Is one of Nancys classmates a crook, or is someone else digging up trouble?