In the halls of Fenris, silence thickens due to the endless bloody battles. The Great Wolf Logan Grimnar is concerned about the losses in the ranks of his warriors and instructs the rune priest Nyal, nicknamed Stormcaller, to find a remedy for the disasters that have befallen the order. As a result, the enemy, who appeared from the past ten thousand years ago, is locked in the mind of the rune priest. He argues that salvation lies where it all began: with Prospero. Gathering a motley crew of wounded Space Wolves, mortal servants, and Lucas the Trickster - more of a hindrance than a helper - the Stormcaller sets out on a campaign. But it soon becomes clear that great forces and grandiose plans are involved in this matter. Now not only the share of the sons of Russ is at stake, but also the fate of the entire Imperium.