In a world where memory-editing allows people to reshape their past traumas, a gifted memory therapist, starts uncovering imperfections within her own recollections.
Thomas Jacobs invents a way to watch people's memories from the inside. Going against his morals, he accepts an offer to enter a heroin addict's memories to literally see if he committed a crime. However,a malfunction causes his consciousness to become trapped inside the criminal's mind. He remains a prisoner in the addict's memories for more than four years until he discovers the possibility of escape.
Joel Barish, heartbroken that his girlfriend underwent a procedure to erase him from her memory, decides to do the same. However, as he watches his memories of her fade away, he realises that he still loves her, and may be too late to correct his mistake.
A young man struggles to access sublimated childhood memories. He finds a technique that allows him to travel back into the past, to occupy his childhood body and change history. However, he soon finds that every change he makes has unexpected consequences.
A man with the ability to enter peoples' memories takes on the case of a brilliant, troubled sixteen-year-old girl to determine whether she is a sociopath or a victim of trauma.