"Back Street" (1941) was lauded as one of the best performances of Sullavan's Hollywood career. She wanted Charles Boyer to play opposite her so much that she agreed to surrender top billing to him. Boyer plays a selfish and married banker and Sullavan his long-suffering mistress. Although he loves Sullavan, he is unwilling to leave his wife and family in favour of her. "So Ends Our Night" (1941) was another wartime drama. Sullavan (on loan for a one-picture deal from Universal) plays a Jewish girl perpetually on the move with falsified passport and identification papers and always fearing that the officials will discover her. On her way across Europe, she meets up with a young Jewish man (Glenn Ford) and the two fall in love.