The setting is England in the reign of King Henry IV. Miles (Tony Curtis) is a headstrong, handsome peasant determined to learn the name of his slain father and discover his true heritage. His fiery ambition and swift sword lead him to the majestic MacWorth castle. There he must compete for both knighthood as well as the hand of the fair Lady Anne (Janet Leigh), but her love is claimed by the evil, conniving Sir Walter Blount (Patrick O'Neal). All the while the English throne is being challenged to the death, from sinister forces within. Soon, the fate of the realm and his beloved Lady Anne, will depend upon his martial skill. But Miles must first unlock the secret of his own shocking, mysterious identity.