The chief of the Great Kiva Society didn't own the masks to begin with. They weren't his. They belonged to… — Douglas Preston

He was ex-military and had always endowed his movements with economy and precision, yet it was mot preciseness that kept him so erect in the chair. A heavy steel bayonet had been driven into his mouth, angling down through his neck and pinning him to the headrest. The point of the old bayonet pierced all the way through the chair back, sticking out the back side, its rough edge heavy with blood. Drops fell from the tip onto the sodden carpet.

She was sitting in a wheelchair whose every surface was encased in thick black rubber. A small needlepoint pillow sat in her lap, on which rested her two withered hands. Ostrom himself pushed the wheelchair, and behind him came two orderlies wearing padded protective garments. She was wearing a long, old-fashioned dress of black taffeta. She looked tiny, with sticklike arms and a narrow frame, her face obscured by a mourning veil. It seemed impossible to D'Agosta that this frail-looking creature had recently slashed two orderlies.

He had entered the house, no doubt immobilized Decker with some kind of drug, then waited for Pendergast to arrive before killing him. Chances were that Diogenes had deliberately tripped the burglar alarm while leaving the house.