One time members of a resistance group come together every year to remember their dead leader, betrayed to and executed by the Nazis. When it seems that they might finally know the name of the traitor - and that he or she comes from within their own unit - their annual gathering becomes a deadly trial...

When Germany invades Holland in 1940, a British intelligence officer and two Dutch diamond merchants go to Amsterdam to persuade the Dutch diamond merchants to evacuate their diamond supplies to England.