Witness For The Prosecution.

Sir Wilfrid Robarts (Charles Laughton) takes on Leonard Vole (Tyrone Power) as a client. Vole is accused of murdering Mrs Emily French (Norma Varden), a rich, older widow who had become enamoured with him. Strong circumstantial evidence points to Vole as the killer, but Sir Wilfred believes he is innocent. He takes on Vole's German wife Christine (Marlene Dietrich), who provides him with letters written by Christine herself to a mysterious lover named Max. Christine then forged the letters to the non-existent Max, and then discredited her