When Leonard Vole is arrested for the sensational murder of a rich, middle-aged widow, the famous Sir Wilfrid Robarts agrees to appear on his behalf. Sir Wilfrid, recovering from a near-fatal heart attack, is *supposed* to be on a diet of bland, civil suits. But the lure of the criminal courts is too much for him, especially when the case is so difficult: Vole's only alibi witness is his wife, the calm and coldly calculating Christine Vole. Sir Wilfrid's task becomes even more impossible when Christine agrees to be a witness not for the defence but for the prosecution.
Esteemed criminal lawyer Sir Wilfrid Robarts has just returned to practice after suffering a heart attack and is supposed to be on a diet of bland civil suits. But the case of Leonard Vole, a charmer accused of murdering a rich middle-aged widow, proves irresistible --- particlularly when Sir Wilfrid meets the accused's wife, the remarkable Christine Vole. Christine will appear as a witness: not the defense, but for the prosecution.
Leonard Vole is an unemployed inventor, his latest contraption being a new-fangled egg beater. He is married but through a chance encounter, became friendly with a rich widow, Emily French. When Vole is accused of her murder, his solicitor refers the case to a brilliant barrister, Sir Wilfrid Robarts to lead the defense. Robarts believes his client to be innocent but his alibi rests on the testimony of Vole's wife, Christine. As the jury would expect a wife to defend her husband, he decides not to call her as a witness. He is surprised however when she is called as a witness for the prosecution. As luck would have it, he comes into possession of letters that seriously discredits her testimony. There is, however, a far more devious plot being hatched, one that even the great Robarts cannot fathom.