They call it "Pulse"—a radio signal which has puzzled the world for 40 years. But now Toshiko Sato has solved it. She's uncovered a message which leads her to Russia, and into an uneasy alliance with the KVI—the Russian equivalent of Torchwood. Toshiko needs to get into Zone 10—a frozen wasteland which officially doesn't exist. An intergalactic war was once fought in Zone 10. And it turns out there's a survivor.