Bookcase
You notice a bookcase full of books in a corner of a cabin. It's a little library! Maybe Mary hid the combinations in the books? You start browsing through the books and discover a common theme -- winter. Given your situation, that seems kind of fitting. You don't find anything that looks like a combination, but you notice that the books all contain bookmarks. Perhaps that is the clue?
You notice a bookcase full of books in a corner of a cabin. It's a little library! Maybe Mary hid the combinations in the books? You start browsing through the books and discover a common theme -- winter. Given your situation, that seems kind of fitting. You don't find anything that looks like a combination, but you notice that the books all contain bookmarks. Perhaps that is the clue?
