At Deauville, an informal conference of diplomatic powers is attended by: Julian Weymouth and his brother Sir Henry, of the British Diplomatic Service; Count Orloff, a young Russian royalist; the Marquise de Zares and her daughter, Dora; and Countess Zicka, who sells political secrets to Baron Ballin, reputedly an agent of the Bolshevik Government. Count Orloff, believing that Dora has been responsible for his arrest in Russia, hastens to warn his friends at the British Embassy, unaware that Julian and Dora, who have just been married, are leaving for London with a treaty from the Chinese delegation. Julian's trust in Dora is shattered when the document is stolen. Julian and Sir Henry make a desperate effort to regain the lost treaty, addressed in Dora's handwriting to Ballin. With the aid of Robert Lowry, an American, Zicka is tricked into admitting her guilt. Julian and Dora renew their vows of love.