Fred takes Pebbles to the supermarket and discovers she puts a lot of things in the basket. Fred is afraid his daughter might be a budding kleptomaniac. While Fred’s at the jeweler’s to purchase a gift for Wilma, a thief plants an expensive diamond collar in Pebbles’s crib. Back home, Wilma is delighted with the “gift,” but Fred suspects that Pebbles snatched it. He goes back at night with Barney to the jewelry store to sneak the collar back, but the thief is waiting there to recover his loot.