Jonathan Hemlock, a secret agent of one of the U.S. intelligence services, has long been retired and is engaged in collecting paintings and art history. However, his former boss does not leave him alone and forces him to accept a new assignment – to eliminate agents of enemy intelligence. Hemlock, as a former experienced mountaineer, will be part of an international group to climb Mount Eiger in the Alps, to identify and eliminate the enemy, who will also be in this group.