LitCharts assigns a color and icon to each theme in The Book Thief, which you can use to track the themes throughout the work.
Death
Words and Language
Books
Stealing and Giving
Color, Beauty, and Ugliness
Summary
Analysis
There is another knock at the door, but this time it's only Rudy checking on Liesel. He lingers at the door asking questions and makes Liesel nervous, but she tells him "everything's good" and he leaves.
Liesel does indeed feel like everything is good now, but Death and the reader both know that terrible things are coming soon.