Joe Selfridge's stage partner Olga dies. Before her death, Joe entrusts his sister Vera, who lives in Warsaw and bears a striking resemblance to his sister, to Joe. Joe takes her into his production, a thrilling world number. During their performance in Budapest, Vera meets Baron Vajk at the hotel, who once loved Olga and now thinks he has found his lost love in Vera. But what will become of Joe without Vera?