When Fred thinks he recognizes a homeless man on the street, his regular life goes off the rails. The thought that he has suppressed something existentially important from his past does not let him go. Visions of his old classmate Cindy begin to haunt him, and memories of his school days rob him of sleep. Is there a connection with the drug Mercury, with which he experimented at the time? Fred sets out to find answers. But the deeper he dives into his subconscious, the more the past, present and future begin to blur ...