Serge Brussolo

The fire children are in war with the rain children. One cannot live without fire and the other without water, and they cannot mix each other. Peace between sides looks impossible, and the priesthood do they best that they never will. (Me)

A young woman who recently graduated from engineering school travels to a remote location to supervise the demolition of a mysterious building. She soon discovers the horrifying secrets of the building and its past inhabitants, many of whom were victims of a vicious murderer who entombed his prey alive within its walls. Now she must turn the tables on the killer before she becomes his latest victim. (imdb)