The document presents a story about a 31-year-old man named Charlie who hallucinates a third level of Grand Central Station, which does not exist. In his experience, he travels back in time to 1894 and desires to escape the harsh realities of his life through this imagined journey. After discussing his experience with his psychiatrist friend, Sam, who also believes in the third level, Charlie finds a letter from Sam encouraging him to continue searching for it.