In the middle of the night, while waiting for a bus in a bus station, a lonely stranger called Mr. Smith sees a pregnant woman being chased by a man with a gun. He follows the couple, kills the man and helps the delivery of the baby in the middle of a shootout while a gang of hit-man tries to shoot them up. The woman is killed but Smith saves the baby, escaping from Hertz, the leader of the killers. Then he meets the prostitute Donna Quintano, who has just lost her baby, and asks her to breastfeed the newborn. They are chased by Hertz and Smith discovers the reason why the bad guy wants to kill the baby.