"The Lost Family" is a 3D horror decryption game that tells the story of the decline and fall of a family against the background of the Victorian era in Europe. The plot has the mysterious color of Norse mythology. The story begins with Ullanius. After experiencing the painful death of his loved ones and relatives in front of him, the cowardly but ambitious Ullanius begins to go crazy. Greed makes Ullanus fear death, and emotional withdrawal makes Ullanus become cold-blooded and ruthless in order to escape the pain of death forever. At the temple on Mount Olympus, he made a wish to sacrifice his own flesh and blood, a man and a woman, to the sea monster Karaken for eternal life. The story takes the form of a flashback in time to guide the player to explore the true image of each member's death, thus breaking the curse of the family. The flashback of time is used to create suspense, in which the flashing picture of the death of the Ox family character guides the player to explore and discover the event, restore the true image of death, and explore the truth of the death of the Ox family.