A Few of My Favorite Things

From the introduction: [The characters] are invited to a patron's home for dinner. The patron's spouse is running experiments in the cellar. During dinner, the spouse leaves to her laboratory. An explosion ensues that rocks the home during dinner as the result of a failed experiment to open a window to a domain of demons; the experiment opens a door instead. Explosion seals the house. The demon world encroaches on the home bit-by-bit.