"The Old Castle's Other Secret", alternately titled "A Letter from Home", is Don Rosa's 2004 sequel to "The Crown of the Crusader Kings". The title is a reference to "The Old Castle's Secret", which was the second story to feature Scrooge McDuck and was the first in which he was a starring character in an adventure with his nephews. The story was first published in the Danish Anders And & Co. #2004-09; the first American publication was in Uncle Scrooge #342, in June 2005. Plot Scrooge McDuck and his family return to Castle McDuck, in Scotland, to find the treasure of the Knights Templar, after uncovering evidence in the previous story that a McDuck ancestor, Sir Simon McDuck, was appointed its treasurer. The Castle's recently-hired caretaker is revealed to be Matilda McDuck, Scrooge's sister (and Donald's aunt and Huey, Dewey, and Louie's great-aunt) who has not spoken to her brother for nearly 25 years. Donald purposely did not tell Matilda they were coming, hoping to effect a reconciliation between her and Scrooge, but Matilda refuses to believe Scrooge is sincere and thinks he is only interested in the treasure. She reveals that the McDuck family has always known about it, but it was their father Fergus's wish that Scrooge not be told. Matilda believes that Fergus knew his son was becoming too greedy for his own good, and Scrooge, who never heard from his father before the latter's death, secretly fears she might be right. Scrooge, despite being hurt and depressed, nevertheless keeps searching for the treasure. However, he is being shadowed by Mr. Molay and a reluctant Maurice Mattressface of the International Money Council (the modern successors to the Templars). Molay has stolen the Crown of the Crusader Kings from its museum in Haiti, knowing it is the key to finding the treasure. Following a series of clues leads Scrooge and his nephews to a vault underneath the Castle, sealed with an elaborate combination lock. Mattressface rebels against Molay, who reveals himself as a member of the villainous Priory of Sion. Taking Matilda as a hostage, he confronts Scrooge and his nephews and forces them to use the key inside the crown to open the vault, but Scrooge jumps into the path of Molay's gun to protect Matilda, while Donald knocks Molay out by breaking the Holy Grail over his head. The treasure is found, but Scrooge agrees with