Professor Wiseman invites George and the Man with the Yellow Hat to the museum to see "The Wonders of Space Exploration" exhibit. It turns out that the main attraction is a meteorite that George himself found in the desert last summer! While admiring the rock, George's fingers accidentally smudge the exhibit case and George makes another cool discovery... his own fingerprints! George becomes so fascinated with them he collects finger and paw prints from all his friends. When the meteorite goes missing, with only a fingerprint left behind as a clue, can his Big Book of Prints help George find the culprit? / When George sees a rummage sale, he's inspired to host one of his own in the apartment lobby but has trouble convincing Hundley to cooperate.
