Request #60

 Hoping someone will remember this one! It’s a historical mystery that takes place somewhere in Scotland. The main character’s name is Phoebe, and she goes to visit (or possibly live with) her sheep-farmer relatives in the Highlands. She has twin cousins named (I think) Ronald and Gavin. There’s a mystery about a castle on a nearby mountain where a Very Bad Man called (I think) the Monster of Something-or-Other used to live, and he either stole all the money belonging to everyone in the surrounding village or forced them to give it to him. Everyone is now extremely poor. The castle is either haunted or they think the Monster still lives there… anyway, everyone is terrified of it and stays far away at all times. Phoebe’s cousins have been absolutely forbidden to even mention it, but of course they do. When Phoebe hears the story, naturally all she wants to do is visit the castle and solve the mystery, even though her cousins try their best to talk her out of it. They do end up solving the mystery. I don’t remember all the details, but one part I remember vividly is that they find the Monster’s skeleton sitting on top of a chest containing all the missing money. I believe there’s also a section where Phoebe’s aunt teaches her to use a spinning wheel. The version I had was a paperback, and I read it sometime in the mid-70s. If anyone remembers this, I would love to track it down and reread it. Thanks!