Interrupted during a robbery, thief Lady Raffles hides in an adjacent mansion and is mistaken for a maid during a party thrown by Warren Blake, who plans to present his mother with a diamond necklace. Also in attendance are Lillian and Dick, two jewel thieves who recognize Lady Raffles and fear that she is there to rob Warren as well. But sparks fly between Warren and Lady Raffles, despite Dick and Lillian's attempts at sabotage.