Former U.S. Justice Department official residing in Geneva, hired by the bank to investigate the blackmail scheme targeting anonymous accounts. He tracks suspects and recovers the ransom diamonds in the Alps after the collector is killed.
Kosta is an external assassin explicitly tasked with eliminating Christopher.
Frey monitors Christopher's unauthorized investigation, creating institutional friction.
Christopher interviews Hayes, who initially refused to pay the ransom.
Christopher questions McGowan to gather clues about the extortion network.
Christopher interviews Abbot as part of his initial victim assessment.
Christopher is formally employed by the bank president to uncover the blackmail scheme.
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