This answer can be found in The Book Theif Part Three:Mein Kampf
Answers 1Add Yours
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.
"This is our secret, this book. We will read it at night or in the basement, just like the others- but you have to promise me something."
The Book Thief