A group of five renowned detectives, each accompanied by a relative or associate, is invited to "dinner and a murder" by the mysterious Lionel Twain. Having lured his guests to his mansion managed by a blind butler named Jamessir Bensonmum, who is later joined by a deaf-mute, illiterate cook named Yetta, Twain joins his guests at dinner. The house is then sealed off. Twain announces that he is the greatest detective in the world. To prove his claim, he challenges the guests to solve a murder which will take place at midnight; a reward of $1 million will be presented to the winner.
