Third-grader Aven Green has been solving mysteries for a really long time--a whole month! She's solved many important cases like The Mystery of the Cranky Mom, The Mystery of the Missing Ice Cream, and The Mystery of the Smelly Feet. Her record is nearly 100% (only The Mystery of the Cereal in My Underpants remains unsolved to this day). Aven asks all the right questions, wields her detective kit carefully, and follows up on every...