When the Voss family moves from Portland to a rural farmhouse in southern Oregon, they're chasing a fresh start. Cheaper land. More space. A barn for Lisa's woodworking. Room for the kids to run. The house is old and creaky and needs work, but Ben can fix it. That's what he does. He fixes things.

Then the root cellar hatch starts opening every night at 3:12 AM. From the inside. Nothing comes out.

Twelve-year-old Owen measures everything. He counts the stairs (12), records the hallway length (14'3"), tracks the kitchen dimensions in a notebook he carries everywhere. He is meticulous. He is precise. And his numbers are changing.

The stairs have 13 steps now. The hallway is longer. The kitchen counter is two inches farther from the island than it was last week. The house looks the same from outside. From inside, the geometry is quietly, steadily wrong.

Lisa feels it before anyone can measure it. She builds furniture for a living. She knows when a room's proportions are off the way a musician knows when a note is flat. And every room in this house is going flat, one inch at a time.

Ben installs cameras. Replaces locks. Watches footage at 2 AM and tells himself there's an explanation. There is always an explanation. Until there isn't.

Seven-year-old Tessa draws the house every day. Triangle roof. Square windows. Door in the middle. But her drawings have started including rooms below the house. Rooms nobody has seen. When her mother asks about them, Tessa shrugs.

"That's the downstairs."

Something beneath the property is building. It has been building for a very long time. It doesn't know the Voss family is there. It doesn't care. Their house is material. Their hallways are templates. Their home is being translated into an architecture that stretches farther and deeper than any of them can imagine.

And Owen's notebook keeps filling with numbers that can't be right.

HATCH is a novel of domestic dread, impossible geometry, and the terror of living inside something that is quietly becoming something else. For readers who have lain awake listening to their house settle and wondered, just for a second, if the house was settling back.