I read this book soooo many times as a teenager. Nearly two decades later I revisited it to see if it held up, and it did. I love the unreliable narration, the atmospheric language, the understated agony of adolescence, and looming spector of war. It's an objectively depressing book, I think, so I understand why some don't like it. But it certainly is the book for me.
"We have taken this short stroll through the Psalter in order to learn to pray a few psalms a bit better." (Page 65)
If you are part of a Christian tradition that prays or sings the Psalms in service, or if you have a habit of praying through them on your own, I cannot commend this book enough to you.
Bonhoeffer looks briefly at each type of Psalm and uses the Lord's Prayer (taught by Jesus) as a rubric and lens for how to pray through them today.