Fire and Ice

On an Imperial world being torn apart by internal rivalries and the influence of the Tau Empire and its pernicious "Greater Good", Interrogator Haniel Mordane is in trouble. Pursued by the Inquisition for his part in a failed operation and guarded by a man he fears and mistrusts, Mordane is still set on doing his duty and defeating the Tau influence. Is a meeting with the mysterious Calavera key? And will Mordane survive as he finds himself on a maglev train, using his interrogation skills on a very dangerous and very special prisoner?