terri plugged in the 1500-watt space heater that night, it heated the electrical wires in the attic, which arced. those sparks touched a carbon track which ignited the paper insulation just above joshua's bedroom closet. >> a wooden ceiling with an already well-built fire that suddenly breaks through produces a holocaust in no time at all. >> the fiery debris from the attic fell through the hole in the ceiling onto the floor of the closet and did not start on the floor and burn upwards, as local investigators suspected. ken gibson believes that the fire officials rushed to judgment. >> anything that doesn't fall into the theory that this was part of how the arsonist started the fire, to them, it's not evidence, it's just something that's there. >> dr. hurst sent the local