In the thirty-second millennium, many centuries after the Heresy of Horus and the Great Crusade, the Imperium still reaps the fruits of treachery. On the planet Gangava Prim found traces of the ghost-traitor Magnus the Red and his Thousand Sons, a legion of warriors-magicians. The Order of the Cosmic Wolves hastily equips the army led by the Great Wolf Harek with the Iron Helmet, for not fully fulfilled in the distant past, the debt to the Imperium curse hangs on the honor of the Fenris Wolves . And while the Iron Helmet with the main forces of the order tries to capture Gangava, Fenris himself is attacked by the Thousand Sons. Magnus’s presence on the Ganga was only a bait, a trap, and now the demon-primarch intends to brutally avenge the Wolves for the death of their native world Prospero. The lair of the Wolves, the great fortress of the Fang, now has to withstand a monstrous siege .. Or share the fate of Prospero .