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East of Desolation (edition 1976)
by Jack Higgins
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Wikipedia in English
When a plane crashes in the icy Greenland desert with no passengers on board, Joe Martin is hired to fly to the scene of the crash by the insurance company involved and the beautiful widow of the dead pilot. But the routine mission spirals into suspense when a priceless batch of emeralds are added to the mystery.
(summary from another edition)
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