Calvin's Bookcase was Calvin Tower's private collection of books. It was brought from Keystone World New York City to Calla Bryn Sturgis via the Doorway Cave. Here Roland Deschain and his ka-tet are able to flip through Calvin's books including many works of Stephen King. The ka-tet comes across 'Salem's Lot, which tells Father Callahan's story perfectly, which causes Father Callahan to question if his choices were his own or spun by Stephen King.