UNKNOWN. Dark Castle/Warner Brothers. Liam Neeson (Dr. Martin Harris), January Jones (Elizabeth Harris), Diane Kruger, Aidan Quinn, Bruno Ganz, Frank Langella, Sebastian Koch. Screenplay: Oliver Butcher & Stephen Cornwell, based on the book Out of My Head by Didier Van Cauwelaert.

   Where to begin? I think I’ll start by saying that this film will remind long-time readers of John Dickson Carr of that author’s tremendous gift of sheer story-telling mystery and suspense, while lovers of Cornell Woolrich will be captured at once by the utter audacity of piling on on coincidence after coincidence, pulling the utterly stunned protagonist deeper and deeper into a nightmarish predicament from which he can find no escape — and have the reader (or as in this case, the viewer) believe every minute of it.

   I don’t believe in reviews that tell too much of the story ahead of time — I started watching this one with no idea of what it was about, only that Liam Neeson was in it, nothing more — and if that’s you as well, you can stop reading now and let that first paragraph tell you all you need to know.

   But in case you’d care to read on, please do. I’ll do my best not to to spill any beans you’d rather have left in the pot. A certain Dr. and Mrs. Harris have just arrived in Berlin for a biotechnology conference, where he is to be a prominent participant. At the hotel while she is checking in, he discovers that he has accidentally left a small case at the airport. He grabs a cab without telling her where he is going, but once en route he finds that there is no cell phone service to reach her to tell her where he has gone. On the way to airport an accident on the road flips the cab into the river.

   When he wakes up, he’s in a hospital. He was saved by the quick actions of the young blonde girl taxi driver (Diane Kruger), who then disappeared. The doctor tells him he may have memory problems for a while. What Dr. Harris doesn’t count on is that when he returns to the hotel, not only does his wife not recognize him, but there is a new Dr. Harris with her. After a short confrontation, with the hotel manager watching, the two of them dismiss him with considerable puzzlement and head off to enjoy their stay in Berlin and the conference together.

   There are some pieces of what I said that may have already set off some alarm bells in your head. Of course I don’t know what you’re thinking, but the odds are that you may easily be onto something. On the other hand, you may not. You will have to watch the movie to find out — and not only is it a puzzler of first magnitude, there is also enough car chases and other action in it, explosions and so forth, to make you wonder how on earth they managed to get it down on film.

   Have I convinced you or not? The movie has gotten somewhat mixed reviews — mostly favorable, I hasten to add — but if you were to ask me, I’d have to tell you that this is a movie that’s well worth your time. Even more than that, I thought it was terrific.