What happenes to Papa when he discovers the book Liesel has stolen?

Liesel shows Hans the book she stole from the book burning, The Shoulder Shrug. Hans examines it and becomes worried about its content and the political repercussions of Liesel's act. Hans asks Liesel if she will keep a secret for him should he ask, and Liesel promises yes. Later, Hans purchases a copy of Mein Kampf from the Nazi Party office and overhears party officials saying that Hans' application to join the party will never be approved.