Having watched for years Jean Dujardin in his hilarious sitcom "Un Gars Une Fille" ,I was wondering how he would manage in a dramatic story.He is quite convincing ,as is Laurent Lucas in a shady role.The story is ,except for the debatable ending,close to the famous Boileau-Narcejac frame-ups with a dash of Patricia Highsmith thrown in for good measure ,but the characters lack in-depth psychology.The movie is too short and the part of Daniel is underwritten.The scene when Dujardin arrives on the scene of the crime shows the influence of Clint Eastwood's "Mystic river" .All in all,this is a rather good thriller,which could have been really great.The short nightmare scene ("I can't ,dad,I'm dead") is effective.