What news does Mr. Kraler bring? Why does this pose a problem?

Mr. Kraler has news about a man who needs a place to hide..... he wants to bring him to the annex.

But today something has happened.... Dirk ... Miep’s Dirk, you know, came to me just now. He tells me that he has a Jewish friend living near him. A dentist. He says he’s in trouble. He begged me, could I do anything for this man? Could I find him a hiding place? . . . So I’ve come to you . . . I know it’s a terrible thing to ask of you, living as you are, but would you take him in with you?