23. 
Nichts: Was im Leben wichtig ist, by Janne Teller. (
Nothing)
When Pierre decides that nothing in life is worth living for, his classmates want to convince him otherwise and start collecting things that mean something to them. What starts innocently with favourite comic books quickly spirals out of control as people are required to give up more and more important things until it ends in excavating bodies, cutting off fingers and, inevitably, rape.
Of course. But it's still a very good book and captivating.
22. 
Unter Verdacht, by Joyce Carol Oates (Big Mouth and Ugly Girl).
When a joke goes wrong Matt is suspected of having planned to blow up the school. The only one who does not believe that is Ursula, sports star and outsider no one likes. Haven't finished this one yet.
21.
Die Lebensfahrt auf dem Meer der Welt - der Topos, by Christoph Hönig.
A book on the topos of life as a sea voyage and the world as that sea, something of a guided tour through different periods with different texts and analyses of what they make of this topos, how they use it and how it changes over the years. Ever since I read Crossing the Bar and listened to a lecture on it by Professor Haas, who was one of the best speakers I have ever heard I've had a soft spot for this topos and enjoyed encountering it elsewhere subsequently (like in Gregorius).
20.

My Gender Workbook, by Kate Bornstein.
Very practical, hands-on introduction to gender, workbook-style.
Haven't finished this one yet but had a good time with the articles and the way they're written as well as the questionnaires. The interludes do feel gratuitous at times, but they don't bother me, it's still very informative.
19. 
How to Win Friends and Influence People by Dale Carnegie.
Holds what the title promises: a guide on how to win friends and influence people, or rather, how to modify your interpersonal skills so as to facilitate that.
Ever since I saw the thread in the Slytherin forum on CS back in the day I've been wanting to read this book. I bought it now that covering communication with my students is imminent and it's enjoyable to read.
18.
The Wise Man's Fear, by Patrick Rothfuss.
This one deserves a bigger review. I did have a good time reading it, but the longwinded pointlessness of vast part of the middle (Felurian. Oh god did that ever
end), some flaws in the setting (would Bast really have sat there for
six hours and listen to Kvothe talk about the fairy realm without comment? Hard to imagine) and the increasing level of NiceGuyness of the main character made this hard to enjoy - regardless of just how much I looked forward to this. I liked how the world opens up and still love the magic system, though I'm getting increasingly uncomfortable at the moral framework of our hero (slaying old ladies begging for their lives is not ok even if you think that they were conspiring with rapists, especially if it's likely that they were forced to play along themselves, asshole). The amount of times in which the
Rule of Cool is used to make something work also baffles me. All in all enjoyable, but there are things that are off.
17.

The Lucifer Effect - How Good People Turn Evil, by Philip Zimbardo.
This one centres pretty heavily on the Stanford Prison Experiment. Again not news, but the conclusion he draws and what he extrapolates about similar scenes from Guantanamo is still worth a read.
16. 
Das Milgram-Experiment, by Stanley Milgram.
An account of the experiment. A classic. I've read it before, and I keep being amazed and terrified at the results.
15. 
Diary of a Wimpy Kid, by Jeff Kinney.
Greg's adventures as a small boy in Middle School. A typical story about a non-stereotypically male hero type whose sidekick inevitably has to be even less stereotypically masculine to affirm them, or something. I can't really say I am care that greatly, but I watched Wonder Years enough in my teens to recognise the narrative enough to sympathise. My students love this book so I gave it a read.