The Mysterious Stranger by Mark Twain is a philosophical novel set in 16th-century Austria. It follows three boys who encounter a supernatural being named Satan, a nephew of the biblical Satan. Satan possesses immense power and grants the boys wishes while revealing the cruelty, hypocrisy, and absurdity of human nature. As the story unfolds, he challenges their beliefs, demonstrating life's meaninglessness and moral relativism. In the end, he reveals that reality itself is an illusion, leaving the narrator to question existence and the nature of truth.
Summary by Dream AudioBooks 
