An escape is made from a French Prison Camp with the news that the French Army is planning a major attack.
Major Rogers, Hunk Marriner, and Langdon Towne fall into the hands of the French who imprison them in a stockade. During the day this trio, and other captured rangers, are forced to build a road through the forest. By night, using stolen tools, Rogers begins to dig a tunnel under the stockade wall.
General Amherst believes that a British captain named Stoddard has found a way to climb the 200-foot-high ""Heights of Abraham"" which shield French Quebec from a surprise attack. Amherst sends Major Rogers to make contact with a party in Quebec who might be able to contact Stoddard who's now being held (and tortured) in a French fort. The party proves to be a pretty woman named Audrey Bonay. She helps Rogers contact Stoddard by means of an arrow shot through the bars of the prisoner's cell. Rogers now returns to General Amherst with word of the location where the cliff might be climbed, but Audrey stays in Quebec to be with her mother.