In 15th-century England, Richard III (Vincent Price) desperately wants the throne, but his ailing brother, King Edward IV (Justice Watson), instead bestows it upon his other sibling, Clarence (Richard McCauly). This sends Richard into a homicidal rage, resulting in Clarence's murder and the deaths and torture of many others who could keep the crown from the crazed man. But as the mayhem continues, Richard's sanity slips, and the ghosts of the murdered men begin to haunt the beleaguered royal.