"They were in the hallway, between the second and third bedrooms, when he saw the door. It was on the left side, set into the wall between the linen closet and the bathroom. A six-panel door, same as every other door in the house - same paint, same hardware, same brass knob. It was not remarkable. It was a door in a hallway in a house, and the only reason Philip stopped was that the floorplan in the listing had shown a linen closet here, and the...