 Fred brings Pebbles to the supermarket and discovers she puts a lot of things in the basket without noticing. Fred is afraid his daughter might get a bit kleptomaniac. While at the jewelers shop to purchase a gift to Wilma, a petty thief puts an expensive diamond collar in Pebbles crib. Back home, Wilma is surprised of the "gift" but Fred suspects that Pebbles grabbed it accidentally. He has to go back at night with Barney to the jewelery shop, but the thief is also on the spot to get back his loot...