"ثم لم يبق أحد" is the Arabic title for the famous mystery novel "And Then There Were None" by Agatha Christie. The story revolves around ten strangers who are invited to a remote island, where they are systematically killed one by one. Each character has a dark secret, and the tension builds as they try to uncover the identity of the murderer among them. The novel explores themes of guilt, justice, and the nature of evil. It is considered one of Christie's best works and has been adapted into various films, plays, and television series, making it a significant part of mystery literature history.