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.
Christopher investigates the blackmail scheme for Hurtil's bank.
The bank hires David Christopher to investigate the compromised numbered accounts, while Johann Hurtil is identified as the bank's president.
Denise provides part of Christopher's investigation into the account scandal.
Christopher talks to Denise Abbot during his investigation of the four surviving people threatened with blackmail.
McGowan is one of Christopher's investigative contacts.
Christopher talks to Dwight McGowan, one of the surviving holders targeted by the blackmail threats.
Their connection is shaped by the investigation and a shared threat from hired killers.
Christopher investigates Robert Hayes among the blackmailed account holders, while Kosta and another assailant are stated to be out to kill both Hayes...
Frey monitors Christopher rather than accepting his activities without suspicion.
Captain Hans Frey is suspicious of Christopher's activities and follows him during the investigation.
Kosta directly threatens Christopher's investigation and life.
Kosta is identified as one of the people attempting to kill both Robert Hayes and David Christopher.
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