A Case of Spontaneous Human Combustion?

Is it possible for a person to burst into flames and be reduced to ashes without sign of struggle or panic and without damaging any of the surrounding materials? Could there be some chemical or electrical imbalance in the body which leads to a kind of spontaneous combustion? But if the fire does not start inside the body, how can traditional science explain away the development of a blaze hot enough to reduce bone to ash without damaging a house? Q.E.D. meets firemen and police officers who have discovered the bizarre remains after these puzzling deaths; and scientists who attempt to set up experiments that might explain the phenomenon.