Kolymsky Heights by Lionel Davidson

Kolymsky Heights. A Siberian permafrost hell lost in endless nights, 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...

"The best thriller I've ever read." - Philip Pullman

"Sensationally good. Cleverly conceived and brilliantly executed. One of the great thrillers of the last century." - Charles Cumming

“An icy marvel of invention...It is written with the panache of a master and with the wide-eyed exhilaration of an adventurer in the grip of discovery. Mr. Davidson has not only rescued one of the most familiar narrative forms of the era, the spy thriller; he has also renewed it.”

- The New York Times Book Review