The Question and Answer section for In a Grove is a great resource to ask questions, find answers, and discuss the novel.
Joseph Balicki is a Polish school teacher, who is arrested by the Germans after he is seen turning Adolf Hitler's picture to face the wall in his classroom. His action was brave, particularly since he knew that to do so out him in grave danger....
It seems the story is structured in sequential order, the order in which the High Police Commissioner interviewed the witnesses.
The policeman's testimony infers that Tajomaru is a well-known criminal, whose history includes murder, rape, and theft.