For some reason this movie seems to have been set up to be perceived as a horror film. From the cover to the synopsis. Even the catchphrase on the movie poster seems like it's created for a horror film.
A scientist who has invented a technique to watch people's memories finds himself in a dangerous situation after he's tasked with entering a heroin addict's mind to see whether the man committed murder.
I find this quite funny as the movie isn't scary in the least. More a psychological drama. (My synopsis might spoil a bit of the beginning so...)
The main character, named Tom, gets trapped reliving the memories of a criminal after trying to demonstrate a new machine's capabilities to interested parties. In the demonstration Tom relives a memory in which the man, Anthony, murders his girlfriend. Tom's body enters a coma after the demonstration while his presence is stuck in Anthony's memories. After discovering that the criminal, Anthony, can see him when they are both in the same memory Tom has renewed hope in escaping.
The movie addresses the accuracy of our memories and how we manipulate our own memories at times by our convictions. It's kind of slow at times but overall I thought it was quite good.