In the title piece, Alan Turing, the father of modern computer science, completes his theorem on Phase Conjugate Grammars for Extra-dimensional Summoning. Turing's work paves the way for esoteric mathematical computations that, when carried out, have side effects that leak through a channel underlying the structure of the Cosmos. Out there in the multiverse are listeners who can sometimes be coerced into opening gates. In 1945, Nazi Germany's Ahnenerbe-SS, in an attempt to escape the Allied onslaught, performs just such a summoning on the souls of more than six million. A gate opens to an alternate universe through which the SS move people and material — to live to fight another day. But their summoning brings forth more than the SS have bargained for — an evil, patiently waiting all this time while learning the ways of humans, now poises to lunch on Earth. Secret intelligence agencies, esoteric theorems. Lovecraftian horrors, Middle East terrorist connections, a damsel in distress, and a final battle on the surface of a dying planet round out this story.

"Stross is the heir of the cyberpunk fascination with the way the world works-or can be made to dance!" Asimov's Science Fiction

"Stross has gene-spliced H. P. Lovecraft and Len Deighton to produce a SF thriller that is both witty and unsettling." Andrew Wilson, The Scotsman

Charles Stross is the author of Singularity Sky, Toast and Other Rusted Futures, and The Web Architect's Handbook.