 Ten people from various walks of life are invited to spend a weekend on an island completely free of charge. All of them accept this invitation, and soon arrive on the island. They are met there by a butler and his wife, and there is no sign of the host nor the owner of the island. The guests decide to settle down and enjoy their holiday. The next day one of them is found dead, and it is then they realise that they have been invited to their respective deaths - one by one - by an unknown assailant, who could well be one of them.