The film settles as a science-fiction/drama/mystery whose play is focusing on and consisting of three things, and those are: 1. The life of Sam Bloom (Peter Dinklage) and his accident, and the memory of his brother who died in that accident. 2. The new machine which can present, play, and save people's memories (which is practically the only reason it is a science fiction movie) 3. Solving the murder of Gordon Dunn (Martin Donovan), the man who made the machine and the only one who knows how to make it and the owner of the only working prototype. There is a thing that many people do not see, or get in the film. Let me first trigger a memory, okay? Fellow reader, you must know the types of films that are boring to watch because the end is pretty obvious? And there are the mystery films which have a sudden plot twist at the end. Well this is neither of them, and both at the same time. As I am familiar with Mark Palanskys work, I expected a good film, and a good plot. There is one sentence which makes the center of the movie: "We are nothing more than the memories we keep." Whilst the sentence repeats continuously the plot tends to prove it. The plot of the recalled memories shows the most, but the key elements of the hardest moments are deleted from the patients' brains by themselves to avoid future mental trauma. And well, the machine brings them back (also with additional side effects). Through the whole film there were hints, through which the viewer could suspect/predict the ending. It was seen that the murder was not the real theme there, it was the story of Sam Bloom which mattered there. This was more of a Predestination resolution with hints hidden through the film. Sam Bloom caused an accident while drunk driving, bumping into a car, which resulted killing his brother. While he couldn't remember the moments after the impact, the only thing he remembered was that his brother told him something (when he set him on the driver position) and then walking away in the forest. In the mean time we get that he makes his wish and promise to find what his brothers last words were, trough that he meets Gordon Dunn. While solving the murder we are going deeper and deeper into the background of the plot, and really there are hints everywhere. Let me state a few obvious: Carolyn Dunn (Julia Ormond), while first using the machine had the exact moment before the impact in the thoughts, and the audience can notice that. And the most important one, the key sentence ("We are nothing more than the memories we keep.") is what it is all about (that's why its continuously repeating). The sample group was made of people with the potential to have a self-erased memory which could change their lives to be better, and while unveiling them everything became worse for them. While Gordon Dunn made the machine practically only so he could be with his daughter (which was killed in the car accident), he did understand the key sentence, and while seeing what the invention did to others, he wanted to kill himself. For that, he deleted his memories and ended his life proving the key sentence, for nothing more than zero memories he had left he also became nothing (for 0 less or equal than x less or equal than 0 x=0) so he become nothing(dead). Technically Sam Bloom was the beginning and the end of the whole story, he was the one who caused the loss of Gordons daughter, which caused in Gordon creating the machine, which then caused in Sam looking for Gordon (to find what the last words of his brother were). While seeing that the last words of his brother were just song lyrics, he found out a deleted memory of his, he was the one who killed the professors daughter. He caused every event involving creating and using of the machine, killed two people in the crash (which he set-up on his brother), and he was responsible for the murders that the machine caused, concretely of the girl killed in testing, but also it was him who caused the suicide of Gordon Dunn.