You'll come up with several different denouements for "Amnesia" - not sure if you'll get the right one.
The story concerns an amnesiac, John Dean (Anthony Calf) who is asked to take part in an experiment for a treatment that shows great promise. At first he refuses. He is not sure he wants to know about his past as he is happily married and has a good life, but he and his wife (Jemma Redgrave) need the money, so he agrees to do it.
DC Mackenzie Stone meanwhile is searching for his wife, who walked out on him a year ago. He has very little memory of what happened and why she took off, except for brief flashes and terrible nightmares. He constantly goes through missing person reports.
When he sees one for a Paul West, he thinks that West might be Dean and starts an investigation. He soon learns that Dean's wife and child were killed in a fire, and then West disappeared. Shortly after that, Dean showed up in their town.
Mackenzie's partner, Brendan Coyle, starts to think that Mackenzie may have killed his wife.
Mackenzie thinks that John Dean is Paul West and that West killed his wife and child and probably killed before.
So who's right? Are they both right? Both wrong? One right and one wrong?
Great story, with the actors' excellent work throughout a bonus. They are all terrific.
I saw this on Netflix - I recommend it highly.