 Sam Roffe, president of a multi-national pharmaceutical corporation, is killed while mountain-climbing. It is first determined to be an accident, but Inspector Max Hormung (Gert Forbe) later deduces that Roffe was murdered. Sam s daughter Elizabeth (Audrey Hepburn) assumes control of the company, and while traveling through Europe she immediately becomes a target as well. Suspicion falls on the Roffe cousins, all of whom want to go public with the company and sell their stock at a huge profit. Since this would be against her father s wishes, Elizabeth rejects their advice and decides to keep the company within the family. As Inspector Hormung investigates the background of the cousins, more attempts are made on Elizabeth s life. Hoping to reveal the guilty party, Hormung is able to connect these attempts to a series of murders on prostitutes, which are recorded on snuff films.