From publisher blurb:
Dungeons are packed with corridor after corridor and room after room, all connected by a countless number of wooden, iron, stone, or otherwise normal doors. At times these doors are trapped, turning a dull encounter with a door into a potentially disastrous encounter.
The twelve doors that follow are not standard dungeon dressing pieces but neither are they traps waiting to be sprung. These unusual doors, manufactured by the dwarven craftsman Belkarath Mountaincrawler, are valuable treasures, each one custom-made for one of the dwarf’s clients. Belkarath Mountaincrawler, dead some eighty years now, made a name for himself as a builder of unusual architecture and furniture, many pieces of which are now in palaces, museums, or lost somewhere in the campaign world.