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Harriet Andersson stars as Marianne Croneman, the bored wife of bourgeois Arvid Croneman (Ulf Palme). Marianne prefers the company of family doctor Lennart Hagg (Erik Strandmark), who reciprocates her feelings. Together, Marianne and Lennart plot the murder of Arvid, making it look like natural causes. While on their own honeymoon, the homicidal couple is brought to justice through an elaborate charade, staged by the dead man's relatives. Also known as Woman in a Fur Coat, Kvinna I Leopard manages to keep the audience guessing from start to finish.