From These Dark Abodes Book

St. Edah's, a house without exit: Lethe and Petunia are mortal prisoners, servants to immortal creatures who unzip from their skin each night and party as skeletons.

Lethe has no memory of how she came to be trapped in this nightmare, only that despite the tenderness she feels for Petunia, she must escape. Together, they traverse the infinite house, searching for passage while finding evidence of their former lives—lives that are not what they believed them to be.

Lethe must decide: join the immortals in their revelry or escape St. Edah's once and for all.