A sensational classic: this chilling tale of Siberian espionage is 'the best thriller I've ever read' (Philip Pullman) ranking with 'The Silence of the Lambs, Casino Royale and Smiley's People' (Spectator).'Hugely thrilling, brilliantly written, perfect ... I didn't want this book to end.' (Anthony Horowitz)WITH AN INTRODUCTION BY PHILIP PULLMANKolymsky Heights. A Siberian hell lost in endless night: the perfect setting for an underground Russian research station. It's a place so secret it doesn't officially exist; once there, the scientists are forbidden to leave. But one scientist is desperate to get a message to the outside world. So desperate, he sends a plea across the wildness to the West in order to summon the one man alive capable of achieving the impossible ... 'Sensationally good ... One of the great thrillers of the last century.' (Charles Cumming)'As significant as ... le Carré in bringing a gritty new realism to the thriller.' (Sunday Telegraph)'A breathless story of fear and courage.' (Daily Telegraph)