Sir Guy is a knight in medieval England. He is strong and valiant but owned no lands. In appreciation for his years of service to King William, he is awarded the land upon which Blackwater Castle was erected. It is said that the previous owners had been slain in battle protecting the castle, except for the daughter. The mystery of Blackwater Castle revolves around the existence of the daughter. If Sir Guy is to fulfill his knightly duties and occupy the castle, he must find the answers himself.