It's Wicked

Film The Wicked Lady, an outrageous bodice ripper from the British Gainsborough film studio in mid-1940s stars Margaret Lockwood as socialite Barbara, a Shakespearean vamp, who having cheated her way into marrying money, becomes bored in the big house and (obviously) takes up the outlaw life of a highwaywoman to add some excitement to her existence. Lockwood is ravishing in the title role although a much of the priority in the lighting department is given to her cleavage, which in an industry untouched by the Hayes code which had stifled overt-sexuality in US films of the time, steals many scenes. Despite the studio bound production values, it's sensationally racy stuff as Lockwood shags, betrays and murders her way through all around her, with only her rival then cohort in crime, Captain Jackson (played with perfectly judged irony by a young James Mason) holding her at bay. The script's hardly literature but like Mrs Miniver (which was released at roughly the same time) its feminism is years ahead of its time. Surprising.