And Then There Were None (1945)

The movie opens with a montage of ten strangers receiving invitations to an island called Indian Island. Each guest has a dark past, involving crimes like murder, manslaughter, or causing the death of others. Curious about the invitation, they all accept and travel to the island.

Upon arrival, the guests are greeted by the butler Thomas Rogers and his wife, Ethel, who are the only staff present. They quickly realise that their host, Mr. Owen, has yet to appear and seems to be absent. While dining together, they notice ten little soldier figurines displayed on the dining table.

Soon after, a recorded voice accuses each guest of their respective crimes, revealing that they have been brought to the island to pay for their actions. Shocked and fearful, the guests attempt to leave the island, only to discover that their boat has been sabotaged.

One by one, the ten strangers start to die in accordance with the nursery rhyme "Ten Little Soldier Boys," which is prominently displayed throughout the house. Each death matches the verse, heightening the paranoia and fear among those remaining.

As the survivors try to unravel the mystery, they realise that the killer must be one of them, going by the name U.N. Owen. Suspicion and accusations arise as they discover secrets about one another, and their trust in each other dwindles.

Throughout the movie, various deaths occur. The first victim is Anthony Marston, who chokes on poisoned brandy after proclaiming his innocence. The second victim is Ethel Rogers, found dead in her sleep from a lethal overdose of sleeping pills. The third victim is General John Mandrake, killed by a falling marble clock.

With the body count rising, the survivors become increasingly desperate. They investigate the staff, each other's motives, and search the mansion for hidden rooms or clues, but find no clear answers. Paranoia and terror grip them, and they become convinced that the killer can be none other than someone among them.

Another death takes place when Emily Brent receives a hypodermic needle, causing her to succumb to a drug overdose. Dr. Armstrong, the only medical professional among the guests, becomes a prime suspect due to his access to drugs.

As trust erodes further, Vera Claythorne, believing Philip Lombard to be the murderer, shoots him dead. However, she later realises her mistake when the lyrics of the nursery rhyme suggest that there must be a hidden murderer on the island.

Vera and another survivor, Judge Lawrence Wargrave, theorize that the killer may be Mr. Rogers. They confront him, but he is found dead shortly after, killed by an axe. The two remaining survivors, Vera and Judge Wargrave, continue their investigation.

Finally, it is revealed that Judge Wargrave, who had faked his own death, is the real killer. Consumed by his desire to bring about justice, he orchestrated the murders, using a variety of methods to kill his victims. He believed that those on the island, all guilty of crimes, deserved to pay the ultimate price for their actions.

Judge Wargrave confesses his rationale for the murders to a distraught Vera. Unable to accept her fate, she hangs herself, leaving Judge Wargrave the sole survivor on the island.

In a final twist, a recording of Wargrave's confession is played, revealing his guilt and his intent behind the murders to the other guests. The film ends with his suicide, leaving no-one alive to tell the tale.