Lilian Stanhope and Nicholas Frame are two actors starring in Macbeth, produced by Sir Roger Haversham, who is Lilian's lover. Sir Roger finds out that he has been deceived by the couple and he threatens to interrupt the performance. During a fight, Lilian kills him accidentally and the two actors decide to take the corpse to his mansion, staging an accident. But Lt. Columbo is in London to learn about new methods of investigation used by Scotland Yard. With a little digging, Columbo smells something fishy in the "accident". Stars Peter Falk.