After World War II, an ex-spy returns to Germany to search for a cache of jewels he hid in a Czechoslovakian convent.

Racketeer Jim Barnes is trying to force the independent taxicab-drivers to join his "protection service" at the cost of five bucks a day. Champion race-car driver, Bob Kane, joins with his friends Lee and "Dad" Martin in a fight for the street rights of a big city.

Berlin provides the backdrop for this crime drama that centers on a military doctor falsely accused of dealing illegal drugs. Determined to prove his innocence, he escapes from the MPs and ends up holing up in the apartment his wife rented. He doesn't know that she has sublet the flat to a nightclub singer. When he finds out, he begs the singer to assist him. She is attracted to him and agrees. The doctor believes that his wife is behind the black-market dealings, but in the end, they find the real culprit.