Please have a quote that supports your answer.
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I think the power of language is one common theme. Death seems to be another.
Here is a great quote about Liesel's love / hate relationship with the power of words,
“I have hated words and I have loved them, and I hope I have made them right.”
The common theme connecting the books that Liesel steals would be that they tell the story of her life. Each book tells a part of her story and represents not only who she becomes as a person but those she loves as well.