The story is set in the reign of Edward III. The hero, Eustace Lynwood accompanies his elder brother and his troop, the Lances of Lynwood, to France, and with them joins the Black Prince in his expedition to Spain. There Eustace distinguishes himself, is knighted, and on the death of his brother in battle becomes the leader of the troop, a difficult post. When the English army returns to France the troop is disbanded, and sometime later Eustace returns to England to rescue his brother's young son, in danger from an enemy of the family. He takes the boy to the court of the Black Prince in France, but falls under suspicion himself. He loses the favor of the Prince, and is sent to a post of great danger. He survives the peril and the story ends with his marriage to the gentle sister of the family enemy.