Leonard Thompson's life hung in the balance as he lay in Toronto General Hospital, his body ravaged by diabetes. With no cure in sight, Frederick Banting and Charles Best's experimental insulin treatment was his last hope. On a fateful day, Thompson became the first person to receive an insulin injection, a bold step that would change the course of medical history. As the needle pierced his skin, a new era of diabetes treatment dawned, and Thompson's life was forever transformed.