Filmed in the Swiss city of Zurich, this Euro-thriller unravels a complicated web of secrecy to get to the bottom of an international blackmail operation that's targeting notoriously covert Swiss banks. Ray Milland plays the bank president who hires American treasury agent David Christopher (David Janssen) to crack the case. Along the way, Christopher suffers health issues, meets some shady characters and romances a pretty girl (Senta Berger).