The survey should have taken two weeks. Map the rooms, measure the walls, photograph the details. Zechariah Wormwood's 1887 estate was being converted into a luxury hotel, and Jackson Hewitt was hired to document every square foot before the contractors moved in.

The Keep was built from imported gray quartz. Railroad money. Wormwood was famous for his philanthropy. Took in destitute women and children. Gave them shelter, food, a second chance.

That was the story, anyway.

On the third day, Jackson's measurements stop adding up. The interior dimensions don't match the exterior. There are spaces behind the walls that shouldn't exist. Gaps that the original blueprints never showed.

His assistant Carla finds the first hidden room behind a panel in the east wing. Restraints bolted to the walls. Scratch marks in the stone. A surgical table with leather straps worn smooth by decades of use.

Wormwood's philanthropy was a procurement system. Three hundred and twelve women and children entered The Keep over forty years. None of them left. The quartz walls absorbed their suffering like a battery, storing decades of pain to fuel a ritual older than the building itself.

And Wormwood succeeded. His body is gone, but something remains in the walls. Something that has been quiet for a very long time. Something that just noticed it has visitors.