The Thirteenth Chair

Mrs. Philip Mason commits suicide after she has an affair with Stephen Lee, a disreputable stockbroker, and sells her husband's securities so that Lee can buy stocks. When Lee goes bankrupt, he blackmails Helen Trent by threatening to reveal silly love letters she wrote to him before she married. Her brother, Willy Grosby, and his fiancée, Helen O'Neil, who lives with the Grosbys, go to retrieve the letters. While Willy waits outside, Lee is knifed to death as he attacks Helen. Lee's friend, Edward Wales, attempts to pin the murder on Helen by having Madame LaFarge, a clairvoyant, conduct a séance. In the darkened room, Wales, through whom Lee's spirit supposedly speaks, is about to name Helen as the murderer, but Wales, who sits in the thirteenth chair, is himself murdered. After Helen confesses to Inspector Donohue that Madame LaFarge is her mother, LaFarge, while conducting another séance, tricks Philip Mason into confessing to the murders.

Although his murdered friend was by all accounts a scoundrel, Edward Wales is determined to trap his killer by staging a seance using a famous medium. Many of the 13 seance participants had a reason and a means to kill, and one of them uses the cover of darkness to kill again. When someone close to the medium is suspected she turns detective, in the hope of uncovering the true murderer.

A phony psychic tries to solve a murder that took place during her seance.

The trial of the collective farm chairman Sagdaev, who deviated from some outdated rules of law in order to develop collective farm production.