 During a cruise in 1983, young Miss Vrijland appears to have taken her own life by jumping out a window. The ship s purser suspects foul play and begins an investigation. The last to have seen the missing woman was her neighbor, elderly Mrs De Vos. The purser soon finds out the victim s husband Jan is having an affair with another woman on board, while the victim was seen in the company of notorious playboy Arnold Pauw. Even the purser s assistant turns out to have done time for forgery.