Witness for the Prosecution

Laughton plays a barrister in London's Old Bailey, who is recovering from a heart attack and advised to avoid any strenuous cases. But when he learns of a tantalizing murder trial about to begin, he cannot resist the opportunity. Power plays a former airman accused of murdering a wealthy older woman who had made him the beneficiary of her will. Dietrich plays Power's wife, who supposedly can provide an airtight alibi for the night of the murder. But Laughton soon discovers more complexities in the case, and the challenges excite his interest.