It happens something like this. Someone finds a badly burnt body in a poorly ventilated room. The body is sitting in a chair or lying on a bed or the floor. The upper body of the victim is a heap of ashes, but one or more mostly undamaged hands or feet may be visible as well. A layer of blackened grease covers the ceiling and walls above the victim’s head, but fire damage in the room is limited to a small area right around and above the body. Objects only a meter away remain untouched by the blaze. Police investigators find no obvious source or cause for the fire.