Garrison's plan to substitute a convict in New York for a lookalike German field marshal goes awry when the convict escapes from prison.

The team accompanies Keeler to the meeting of German officers where he is to give the go-ahead on the plot to kill Hitler, but things go awry again when Keeler is killed.

The team must enter a room with an unexploded bomb in order to crack a safe containing a vital sample of heavy water.