The Dawn Express plot
"Lured into a trap by a Mata Hari... the lives of his loved ones was the price demanded for his honor!"
During World War II, a band of Nazi spies in the United States is after a chemical formula. This chemical formula increases the power of the current fuel for the US military. Two US chemical companies are developing this formula, each company half for safety reasons. The spies get their hands on half of the formula and they know that one of the two chemists, Robert Norton or Tom Fielding, is familiar with the other half. Tom is kidnapped with a ruse from the spy Linda Pavlo. Linda threatens the lives of Tom's mother and his sister Nancy Fielding, who is engaged to Robert, if he does not reveal the formula. On the night plane the 'Dawn Express', Tom pretends to know the complete formula to the leader of the spies.