creature of fenkenstrain

okay so it tells me to Search the bookcase in a room to the west for the book Joy Of Grave Digging and you get a marble amulet, then search the bookcase in a room to the east for the Handy Maggot Avoidance Techniques and you get an obsidian amulet. Use them with each other to make a star amulet but when i do it . it says the book is empty or w.e