A warm summer day in 1944 and the habitants can't believe it. The allies were already in Belgium and maybe they will liberate the Netherlands shortly! For 2 years they hide themselfs in the Achterhuis, and the company of Otto Frank (Opekta) operates 'by itself'. Four employees know of the 'onderduikers'. The others? They know nothing....
But then.....Julius Dettmann is an officer of the SD (Sichterheitsdienst) and he works in Amsterdam. He gets a phonecall and directly after, he calls Karl Silberbauer. The mission is clear: 'You must get the 'onderduikers, Prinsengracht 263. You must go to the Achterhuis'.