Joan Cameron is engaged against her will to Paul Bisson, the trading post factor. While her father and Bisson are away, Joan's sister, Esther, elopes with trapper Jules Perrault, and Joan meets Barry O'Neil, a dashing Northwest Mounted Police officer who falls in love with her and departs, promising to return. Months later, Esther, bearing a child, returns. Cameron and Bisson also show up unexpectedly, and Joan claims the child as her own to save Esther from Cameron's wrath. In pursuit of Esther (who he believes murdered Perrault), O'Neil chases Joan, unaware that she is his "Colleen," when she flees with the child in a canoe during a raging forest fire, assisted by Jerry-Jo, the half-breed. Bisson, enraged, also gives chase, kills Jerry-Jo, and then dies when the half-breed's dog attacks him. Joan and O'Neil return to the post to find Perrault, still alive, planning to marry Esther.
—AFI