During World War II, German defector Robert Crain is forced into a deadly assignment by the British: disarm the explosives on a freighter carrying valuable crude rubber. This desirable cargo is intended for the Nazis, but the Allies would like to get their hands on it instead. Crain poses as a Nazi officer to gain entry onto the ship, but the freighter's German captain suspects Crain's true motives, and refuses him access to most of the ship. Can Crain find the explosives -- and discharge them?
