The novel tells the hilarious exploits of another pre-teen genius Fletcher Moon, a mere 12 years old and already a graduate of an online detective course with a badge and everything. Fletcher Moon has never been like other kids. For one thing, he has had to suffer the humiliating nickname "Half Moon" because of his short stature. But the real reason Fletcher is different is that ever since he was born, he's had the nose for sniffing out mysteries. His first case: April Devereux, classmate and archetypical "mean girl", hires him to find out who swiped the lock of a pop star's hair that she bought on eBay. Suspicion centers on Red Sharkey, oldest son of the town's most notorious crime family. Unraveling the mystery leads Fletcher to break rule No. 1 in his detective's handbook-"Be invisible"-as Fletcher follows the clues, a conspiracy begins to emerge. But before he can solve the case, his prized badge goes missing and Fletcher finds himself framed for a serious crime. To clear his name, he will have to go on the run from the authorities, and ally himself with his chief suspect, left with 12 hours to prove his innocence by finding the guilty party.