Answer:
1.In act 2, scene 1 of The Diary of Anne Frank, Mr. Kraler reveals to Mr. Frank that one of the workmen has approached him about the whereabouts of the Franks. Mr. Kraler didn't think much of it until the man asked about a door that used to go up to a loft. Immediately thereafter, the man asked for twenty guilders added to his pay each week. Mr. Kraler says the man didn't define his demand as blackmail, so he isn't sure if that is the case or not. Mr. Van Dann immediately believes it is blackmail and the man knows about Jews hiding on the premises.