In this WW II espionage adventure set in 1940, British Captain Terence Stevenson is assigned to sabotage a Nazi controlled Czechoslovakian factory after he steals the formula for the gas. To do this, Stevenson assumes the identity of Jan Tartu, a noted Rumanian chemical engineer, and gets a job working in the target factory. He stays at the home of Inspector Otto Vogel and there meets three attractive women, one of whom works for the underground. Another is an Allied agent and together the three work to accomplish the dangerous mission. The film is also called Tartu.