A man is mistaken by foreign agents for a defecting cosmonaut and must prove his identity while evading capture.

Joe O'Hara finds out he has a damaged optic nerve just before a boxing match for the title. He needs the money badly, so he doesn't delay the fight. The opponent discovers Joe's weakness and pounds on his eyes, causing him to go blind.

Leo, a holocaust survivor who suffers from total amnesia, comes to the U.S. and works as a hotel desk clerk. One night while a comedian who owns a bar in the hotel gives him a drink, he breaks out in song and discovers a great voice. Under a psychiatrist's treatment, and because of a blow to the head by some hoodlums, he realizes his name is David and that he was the son of a great Jewish Cantor, and gradually recovers his memory of losing his parents. He gives up a promising career singing in nightclubs to return to the synagogue.