The plot of "Amnesia: Ghost of the Past" tells of the misadventures of the protagonist by the name of Daniel. What happened and how he got into the walls of a dark and gloomy castle, he does not know his memories erased someone else's terrible hand. He knows only one that examined all the corners of the medieval citadel, the memory returns to him and find out. But destined to whether this happen? After all, mist-filled corridors to hide not only unsightly surroundings, but also has something more dangerous and terrible thing that moves on him, that is looking for a victim that lives our fears ... The end of the story can put in the player.

Joel is stunned to discover that his girlfriend, Clementine, has had their tumultuous relationship erased from her mind. Out of desperation, he contacts the inventor of the process, Dr. Howard Mierzwiak, to get the same treatment. But as his memories of Clementine begin to fade, Joel suddenly realizes how much he still loves her.