Whoever likes movies of the late Forties should not miss this one. It tells a typical film noir story that is coherent and easy to understand. Impact is a quite artful picture, obviously made by first rate professionals. The balance between location shooting (mainly in and around San Francisco) and the extraordinarily stylish sets is in my opinion perfect and well thought out. At the center of the story is the attempted killing of the main character by his wife's lover. The car with the two men drives at night along a sinuous mountain road. It slows down and stops because of a flat tyre. As the viewers already know, this is the spot where the murder should take place. With unbelievable ease the natural surroundings (reminding you of the dramatic climax in Hitchcock's Family Plot) change into an almost expressionistic stage set with artificial fog at the bottom and everything. It is an unforgettable moment. What the film people could achieve in those days!
Brian Donlevy has some very good moments. As after a phone call he fully realises that his wife who he naively loved (calling himself "Softy" in his messages to her) had cheated and betrayed him, he stumbles to a bench on a station platform, stares into the void with dim eyes and then starts crying with rage and frustration. The scene takes almost a minute and proves that Donlevy is a much underrated actor who should be honored more.
Apart from the realistic presentation of parts of San Francisco in the late Forties (it complements Welles impressions in Lady from Shanghai"), Impact has some nice pieces of slang (at least to a foreigner whose mother tongue is not English). "Grovel a shuteye" for "taking a nap", that's nice, isn't it?
