The Eiger Sanction (Jonathan Hemlock, #1)

Jonathan Hemlock, Professor of Art, world-renowned mountain climber and freelance assassin for the CII. Hemlock is sent to Switzerland on a mission to climb the notorious Eiger peak of the Alps, whose north face has meant death to many climbers. Hemlock's target: one of his three fellow climbers. The only problem is, CII can't tell him which one...