Fact1: cable tram In is cut killing cook morning, Fact2: Mandrake conducts search of chalet 's catacombs leading to demise stabbed after being led to planted distraction, Fact3: Owen is not host in reality, Fact4: Grohmann After attempts to make escape down mountain peak ending in death after lifeline is severed with axe falling under suspicion from others, Fact5: Judge Cannon In is found with gunshot wound to head confusion
Output: Ten people travel by aerial tramway to a snowbound mansion, invited there by a Mr. U.N. Owen to spend the weekend. They discover that none of them has actually ever met Owen, including his secretary as well as a married housekeeper and cook, all hired through an agency. Framed copies of the childrens nursery rhyme Ten Little Indians are hung on the walls of each guests bedroom. Dinner is served by the butler Grohmann on a tray adorned with ten little Indian figurines, as well. At exactly 9 p.m., as instructed, Grohmann switches on a hidden tape recording. A man identifying himself as Owen reveals that each of the 10 guests has a scandalous secret, their involvement in various innocent peoples deaths. One by one, the guests begin dying off. Mike Raven chokes after taking a drink and dies, and a little Indian from the centerpiece tray is broken away. In the morning, the cable tram is cut, killing the cook, Mrs. Grohmann who attempted to escape. General Mandrake conducts a search of the chalets catacombs, splitting everyone into pairs, ultimately leading to his demise, stabbed after being led to a planted distraction a cat. It becomes clear that their unseen killer is following the nursery rhyme. Ann Clyde, the secretary, enters into a romantic relationship with engineer Hugh Lombard as they and the others begin a deadly catandmouse game, ultimately deducing that Owen is not their host but, in reality, one of them. After falling under suspicion from the others, Grohmann attempts to make his escape down the mountain peak, Devils Leap, ending in his death after his lifeline is severed with an axe. Ilona bitterly confesses to having driven her husband to suicide, and is later found dead in her bedroom, killed with a syringe. By now, the five remaining guests fall under distrust of one another, and alliances are formed as the generator shuts down, casting the mansion into total darkness. At dinner, each person reveals the nature of their accusations, but before Ann can attest to her crime, she separates from the group to her room, where she screams upon discovering an Indian decoy hung from the ceiling. In the confusion, Judge Cannon is found with a gunshot wound to his head. Dr. Armstrong intimates his suspicions of Ann, which Lombard angrily rebuffs. Lombard later comes to Anns room and confides that his real name is Charles Morley, and that the real Lombard had committed suicide and he took his place for the weekend. Morley gives Ann his revolver for her protection. In the morning, Blore discovers that Armstrong has vanished and the three conduct a search for him. Blore separates and goes outside where he is crushed by a large statue of a bear. Ann and Lombard discover the body of Dr. Armstrong in the snow and conclude that the killer can only be either of them. Ann pulls the revolver on Lombard and shoots at him, before returning to the mansion. She goes upstairs and discovers Judge Cannon very much alive, who explains how he enticed Dr. Armstrong to help him fake his death and that he intends to poison himself leaving Ann the last remaining survivor, who must hang herself and fulfill the rhyme, or be punished by the law instead. As Judge Cannon is explaining his plan, having taken a fatal dose of poison, Morley reappears alive. They had faked his death after the bullet missed. Ann and Morley had planned the fake shooting scene as they had figured out that neither one of them was the killer. As he dies, Judge Cannon realizes his plan has failed, and Ann and Morley kiss in relief. They see the cat sitting among the fruit tray with only two Indians attached.