The Emperor's Golden Throne is the best known throne on Terra – and it is Malcador the Sigillite's ultimate destiny. But it is not the only throne on the Imperium's heartworld – Malcador himself has one, in a chamber he uses to pluck secrets from the tides of the immaterium. When his scryings draw the Sigillite to the world of Thawra, he finds a planet plagued by a new terror – an organised corps of psykers. As war rages on the world and witch battles witch, Malcador wonders if this may be a portent of the terrors to come…