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An American scholar in Berlin (Liam Neeson) is involved in an auto accident and spends four days in a coma. When he comes to, he can’t prove who he is; even his wife (January Jones) says she doesn’t recognize him, and only a German cabdriver (Diane Kruger) believes him. Some movies are like puzzles that you work purely for the pleasure of seeing how the pieces fit together, and this is one. The script by Oliver Butcher and Stephen Cornwell (based, apparently loosely, on a novel by Didier Van Cauwelaert) keeps you guessing right up to the climax, and the story as it develops is satisfying, if not entirely plausible. The movie plays on our knowledge of the clichés of the genre to throw us some very satisfying (if far-fetched) curves.