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.
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