Sign of the family

England, the year of our Lord 1277
Christopher de Glenville, Baron of Dartworth, is leaving for a military campaign against the self-proclaimed Welsh prince Llywelyn ap Gruffydd, leaving his castle in the hands of the young Thomas Stockton. Thomas soon uncovers a secret hidden in the castle by the baron's father after his return from the Seventh Crusade. It is so powerful that it could change the course of the world. Thomas slowly deciphers the mysterious clues that are meant to lead him to it, and gradually learns of the darkness that connects his father's family with the Glenville family. He realises all too late that he can trust no one. For there are those who greatly desire the secret – and they will stop at nothing…