In this movie, Sigourney Weaver is thoroughly believable with her trademark edge, rarely seen in other women actors. The doctor, although obviously with selfish motives, kept me guessing until the end as to whether he was guilty of the crimes of torture she claimed he committed against her, having not seen the face of, but only having heard the voice of the man she remembered. You don't know the truth until the end. It is very riveting. Her relationship with her husband is very realistic, as well, and very revealing about both of their characters. All three roles were depicted as intensely real. I enjoyed this thriller from the moment it began to the very end. You are immediately engaged in her reality, rather than experiencing a slow build up seen with most movies. Very satisfying because no character was one-sided, but they were multi-dimensional, with each having a unique history. Bravo!