Based on a story by Robert Louis Stevenson, and with a cast including Oliver Reed, Donald Pleasance and the Spanish character actor par excellence, Fernando Rey, Spanish monuments such as the cathedral of Ávila transport us back to the carnage of the Wars of the Roses, and the cathedral is used for the wedding scene and also the cloister scene where Pleasance (Sir Oliver Oates) betrays Reed (Sir Daniel) to Rey (The Earl of Warwick). The walled city of Ávila played the walled city of York.