Andre Desormeaux, master con artist and jewel thief, has been very successful with his partners, light-fingered Polo and beautiful lure "Countess" Tanya Vronsky. But Tanya falls in love with one of their victims, resigns from the team, and (despite Andre's warning) marries rich young Paul Vernay...for love. Inevitably, Andre and Polo reappear in her life. Can Tanya outwit the master schemer?
In Europe, the charming Countess Tanya Vronsky provides the bait for jewel thieves Andre Desormeaux, the mastermind, and his light-fingered stooge, Polo. Their routine is soon spoiled in Nice, France, however, when the countess falls in love with one of their victims, Paul Vernay. After cheating Paul out of his money, the countess returns it to him and tells Polo and Desormeaux that she has decided to end her association with crime and marry Paul. Desormeaux tries to keep the countess on by reminding her that it was he who saved her from being just a third-rate ballet dancer, but she refuses to reconsider. Months later, Desormeaux and Polo find the countess in Paris and attempt to persuade her to return to the racket. Hoping to get Desormeaux and Polo out of her life once and for all, the countess pretends to agree to rejoin them, but immediately sets up her ex-compatriots to be caught in their next scheme. The countess' scheme fails, however, and the two come looking for her during a party at the Vernay mansion. Posing as guests, Desormeaux and Polo try to blackmail the countess, demanding 200,000 francs to keep her past dealings a secret from Paul. When Andre diverts the countess' attention away from Polo, Polo steals jewels from the guests and flees with Desormeaux. When the countess discovers the crime, she and Paul chase after them in their car. While in pursuit, the countess tells Paul about her past, and he forgives her. Meanwhile, Polo, who has had a change of heart, returns to the Vernays', unknown to Desormeaux, and returns the stolen jewels. When the Vernays return, they show their genuine appreciation for Polo's good deed and forgive him. The countess then performs the ballet "Swan Lake" for the guests, and Polo returns to meet Desormeaux aboard the ship on which they will be sailing to America. As the ship is about to leave port, Polo shows up with a suitcase supposedly filled with the stolen jewels, but instead of handing it over to Desormeaux, he drops it in the ocean and pretends that it was an accident.
