Night Without End by Alistair MacLean Book

This book is from 1960. From the acclaimed master of action and suspense. The all time classic. An airliner crashes in the polar ice-cap. In temperatures 40 degrees below zero, six men and four women survive. But for the members of a remote scientific research station who rescue them, there are some sinister questions to answer — the first one being, who shot the pilot before the crash?