During the Wars of the Roses (1455–1487), Sir Daniel is a powerful, unscrupulous knight, surrounded by treacherous retainers: Sir Oliver Oates [Donald Pleasence], Sykes [Frank Braña], Appleyard [Robert Russell], and Scar [Aldo Sambrell]. Since the white rose of the House of York is in the ascendant, Sir Daniel and his household are loyal to York and the white rose. The film takes place just before Warwick [Fernando Rey], the 16th Earl of Warwick, leads his rebellion against Edward IV.
Some twelve years earlier, Daniel, Oates, Sykes, and Appleyard perjured themselves to attaint a nobleman who would later be known as Black Arrow [Stephan Chase]. He went to France in exile while his five-year-old daughter Joanna [Georgia Slowe] was made a ward of Sir Daniel. Black Arrow had not seen his daughter for twelve years since she had been kept in a convent during the wars. Sir Daniel was also the guardian of his nephew Richard [Benedict Taylor], who is trained to fight by Scar [Aldo Sambrell].
Scar and Richard are unaccountably enemies. On the eve of Richard's twenty-first birthday he is finally able to defeat Scar, although Scar is handicapped by his left hand tied behind his back. Sir Daniel's court then hails him as Sir Richard after he takes the oath to be loyal to the white rose of the house of York.
Sir Daniel arranges for Black Arrow's now seventeen-year-old daughter Joanna [Georgia Slowe] to be brought from the convent to his castle to keep her from being rescued by her father. He also plans to marry her to take full possession of her inheritance.
Appleyard is sent by Sir Daniel to one of his tenants to confiscate livestock for the Earl of Warwick's upcoming visit. Richard [Benedict Taylor] is also sent to assist Appleyard. Appleyard surmises that Black Arrow will confront him, which he does. Black Arrow, accompanied by Lawless [Roy Boyd] and armed with a long bow, succeeds in killing Appleyard, while Richard challenges the outlaws to a duel with staves, but he is beaten and sent back to Sir Daniel.
Joanna at Sir Daniel's castle is a defiant adherent to the red rose of Lancaster, and she outrages Sir Richard by daring to wear a red rose in Sir Daniel's household. Richard angrily snatches the red rose off Joanna's dress and crushes it.
The Earl of Warwick comes to Sir Daniel's castle for a visit during which time Sir Daniel persuades him to outlaw Black Arrow. Warwick is eager to help Sir Daniel because he wants to enlist his help in his future revolt against King Edward.
Joanna overhears Sir Daniel and Warwick planning for her marriage, so she steals Sir Richard's clothing while he is bathing and escapes from the castle. Sir Richard is sent by Sir Daniel to recapture her and take her to York where Sir Daniel and Warwick have gone. Secretly Sir Daniel sends Scar [Aldo Sambrell] and men-at-arms to kill Sir Richard and frame Black Arrow for his murder so as to take over his inheritance.
Joanna succeeds in ambushing Sir Richard, who in turn overpowers her. While this is going on Scar shoots Sir Richard in the shoulder, but Joanna comes to his rescue. Hearing the approach of Scar and his companions, Joanna rides off to draw them away from where Sir Richard lies gravely wounded. She is then captured by Scar and his men and taken to York. Sir Richard is discovered by Black Arrow and his men, who subsequently capture Scar. Sir Richard recovers sufficiently to engage Scar in close combat, which ends in Scar's death.
In York, Oates [Donald Pleasence] reminds Sir Daniel that he will be a bigger land owner than Warwick and, then, double-crosses him by going to Warwick with the information that it was Sir Daniel that had Sir Richard killed. Oates is also fortunate in capturing Black Arrow and his companion Will, when the two arrive in York incognito to stop Joanna's marriage to Sir Daniel. Sir Richard manages to get to Warwick in York. Warwick, who is wary of Sir Daniel, grants Sir Richard's request to release Black Arrow and his companion. During Sir Daniel's wedding it is Richard, Black Arrow and Will who stand up to show just cause why Sir Daniel and Joanna should not be joined in marriage. Oates [Donald Pleasence] also stands up denouncing Sir Daniel as a murderer. Sir Daniel dispatches Oates with a tossed dagger. Sir Richard fights blade to blade with Sir Daniel but is disarmed and nearly killed, but Black Arrow [Stephan Chase] succeeds in killing Sir Daniel with a black arrow. Sir Richard and Joanna marry and ride off into the sunset, ostensibly heading for Sir Daniel's castle which Sir Richard has automatically inherited.
