Brian MacLean is a brash and skilled Canadian bush pilot known for his daring flights and sometimes reckless behavior. He earns a living flying supplies to remote northern outposts, often clashing with fellow pilots who dislike his disregard for rules. One day, while trying to impress the beautiful Emily Foster, Brian's antics rile up husband-and-wife pilots Johnny and Helene Dutton. Despite the tension, Brian eventually forms a competitive yet respectful camaraderie with them and their colleague, "Tiny" Murphy. Their lives take a turn when news reaches them about the ongoing war in Europe, sparking discussions among the pilots about their potential involvement.

Inspired by patriotic duty, they consider enlisting in the Royal Canadian Air Force. Initially, Brian is reluctant, valuing his independence too much. However, stirred by a sense of purpose and a desire to contribute to the war effort, he decides to join his fellow pilots. Their transition from unruly bush flyers to disciplined military pilots presents challenges, and Brian's defiant nature clashes with the structured demands of air force training. As they adapt to their new roles, Brian's story unfolds against the backdrop of wartime aviation, illustrating the pilots' transformation as they grapple with their identities and commitments. The narrative focuses on their evolving dynamics and growth as they prepare to face higher stakes beyond the isolated skies they once flew.