Chapter 13 Based on the reaction of Lieutenant Kotler when he is questioned about his father. Why do you think Lieutenant Kotler's father left for Switzerland

Based on Kotler's reaction, we can infer that he was embarrassed by his father's actions. Whereas, Kotler is embarrassed, Bruno's father immediately becomes suspicious.

'And what reason did he give, might I ask,' continued Father, 'for leaving Germany at the moment of her greatest glory and her most vital need, when it is incumbent upon all of us to play our
part in the national revival? Was he tubercular?'