Sir Arthur Conan Doyle referred to Sir Nigel as "the most complete, satisfying, and ambitious thing I have ever done."
During the Hundred Years' War, Nigel Loring leaves his hometown and pledges his fealty to King Edward. Nigel does not look to be a formidable warrior. He doesn't have the muscles of most soldiers but he has the "lion heart and the blood of a hundred soldiers thrilling in his veins." Driven by his desire for glory, he quests to achieve heroic deeds. He is in love with Lady Mary, but must complete three courageous acts before he can marry her. Along the way, he encounters challenging battles on land and sea and a harrowing confrontation with a dangerous French spy. To overcome the odds, Nigel will need his unwavering spirit and perceptive wit.