Trixie Belden and the Mystery of the Antique Doll

Trixie and Honey offer to help out an elderly woman who has sprained her wrist. She lives next door to the new antique store. Trixie is immediately suspicious when she and Honey go in to look around and the owner of the store doesn't seem to know anything at all about antiques. When he finds out the girls are going to Paris for the weekend on Mr. Wheeler's private jet, he asks if they'll do him a big favor while they are there and pick up a doll from a man. He's too afraid to ship it because she's so valuable and frail. The girls of course agree and bring the doll back. Turns out the doll is concealing engraving plates to make counterfeit twenty dollar bills. Boy, these two. Even a simple jaunt to Paris has to turn into something sketchy :)