The story likely follows the adventures of Bill Biddon a trapper living in the Northwest a region known for its wilderness and frontier challenges during the 19th century. As a trapper Bill Biddon would face various dangers including wild animals harsh weather and encounters with Native American tribes some of which might be depicted as friendly and others as hostile reflecting the complex and often romanticized view of the frontier in literature of that era. Themes in the novel probably include survival bravery and the spirit of adventure. Ellis's works often highlighted the virtues of courage resourcefulness and the pioneering spirit making them popular among young readers of his time. Bill Biddon Trapper would likely feature detailed descriptions of the landscape wildlife and the daily life of trappers providing an engaging and educational glimpse into the frontier life of the Northwest.