Korda took charge of her career after this point and brought her to Hollywood where he set her asking price at $50,000 per film. However, as Duprez had not yet achieved the level of popularity in America that she had in Britain, this tactic only served to place her out of contention for most roles. When she was finally released from Korda's contract, she appeared in such low budget fare as They Raid by Night (1942), Little Tokyo, U.S.A. (1942), and Tiger Fangs (1943). Clifford Odets' grim None But the Lonely Heart (1944), in which she co-starred with Cary Grant and Ethel Barrymore, commenced a brief return to films of higher production values. Duprez joined a top ensemble cast in René Clair's film version of Agatha Christie's And Then There Were None (1945). That same year, she appeared opposite John Loder in The Brighton Strangler. In the film noir Calcutta (1947), she starred with Alan Ladd, Gail Russell, and William Bendix.