FBI agent Pendergast returns to puzzle out a murder with demonic overtones in this thriller by bestselling writer team Douglas Preston and Lincoln Child. A mark in the shape of a hoofprint lies next to the charred corpse of universally disliked art critic Jeremy Grove. Southampton cop Vincent D'Agosta and FBI agent Aloysius Pendergast find any number of likely human suspects, but is it possible that that Grove's murderer was actually not of this Earth?