"We've been robbed!" is the museum's curator cry, and the opening scene in this hilarious mystery about a museum's missing dinosaur bone. During the night, as the watchman slept, someone sneaked into the museum and stole a humongous dinosaur bone. But who stole it? And how did they do it? And why steal an old bone when there were much more valuable items with gold and jewelry to steal? Mayor Piddlewicks and the police are baffled, as they ponder over clues that were left behind at the crime scene. The mayor decides to hire a "top cop" who promises to catch the thief. Meanwhile the townsfolk are terrified and start locking their doors at night, And then the thief strikes again, leaving behind even more important clues. And this time, the museum's security camera has caught an image of someone obviously dressed in disguise. The mayor then puts two and two together and comes up with a trap for the thief. Bingo! The thief is finally caught! But what was the mayor's trap that led to his capture? And who is the infamous thief?