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Joan Hope (Mary Miles Minter) is the bored daughter of a chewing gum magnate. When her father goes away on business, she goes in search of some excitement. She takes a train ride during which she meets Kent Standish (Alan Forrest), an amateur detective. He is, in fact, searching for the passenger sitting next to Joan -- the "Countess of Crex" (Margaret Shelby, Minter's sister in real life). The Countess is really a notorious European thief, and has in her possession a stolen necklace. As a way to avoid detection, she convinces the naive Joan to exchange identities with her for a week. When they are exchanging purses and identification, somehow the box containing the necklace gets switched with Joan's box of chewing gum. Joan registers at the hotel where the Countess is supposed to be staying, and the other criminals who are there indicate to Joan that they want the necklace. Joan, of course, has no idea what they want. Meanwhile, Kent has followed her and he finds himself falling in love with her, even though he knows that the Countess is an evil woman who already has a husband. Eventually, Joan's father come to the hotel in search of Joan, the Countess comes looking for her necklace, and everything gets cleared up at the police station. Kent is happy to know that the girl he loves really is innocent, and single to boot.