His longtime friend, Sir Reginald Mesgrave, approached to Holmes. He is scared and is on the verge of a nervous breakdown. Sir Reginald was extremely excited because he was 33 years old, which means having to go through a mystical rite of passage, after which he would become the full owner of the entire heritage of Mesgraves. During the same rite Reginald's father was killed. And Reggie and his brother Tom became random witnesses of the tragedy. Tom is extremely dissatisfied that his brother came accompanied by strangers. The rite is available only to the initiated. In this ritual, the key to the treasures of King Charles the First Stewart, which according to legend are hidden in the castle, is encrypted. Accidental witnesses are waiting for death.