The movie starts with Robin's character, Alan, as a boy enticing another boy into a dangerous building and when he teases the boy to come across a board over a deep hole, the boy falls. Alan remembers blood all around him. His family is just in the area for a visit, so he leaves thinking he's killed the other boy.
The movie cuts to the near future where a memory implant called Zoe can be bought and placed in a baby's mind, if you have the money. The implant grows with the person and remembers everything they see (and runs a clock at the bottom of the display). "Cutters" are people who take the implant after death and make nice movies for the family's Rememories -- a rough equivalent of a funeral or wake. Alan is a highly-wanted cutter. There's a backlash against the implant, after all, people have been observed by the now-dead and their privacy is being invaded, but so far, the implant is sacrosanct.
Alan takes on an implant that is considered to be touchy since there's some belief that the deceased has done bad things. The protestors want the implant, too, because the deceased was an exec of the company that invented and makes the implants. While Alan is watching the implant (the set design for cutters is very well done), he finds an adult who he is sure is the kid he killed. He spends time trying to find out for sure and in the process is in danger, finds out life-changing information, and takes chances.
It would be hard to say I enjoyed this movie, it's very solumn, but the point was very effectively made. As a fan, I've read this point made many times so it wasn't a new point.