I don't have many clues to identify this, but I was sitting next to someone on the tube recently who was reading a kindle book about teenagers and why they behave the way they do, tips on how to deal with stroppiness, mood swings, unreasonableness, etc. I didn't want to admit to reading over her shoulder, so didn't ask the title. I've looked on Amazon and there are dozens of books on this topic - can anyone recommend one?
One of the most famous and good ones is Blame My Brain by Nicola Morgan. It's widely recommended.
I quite like Positive Parenting for Teens, because I really love and trust that way of parenting, and it's helped me since DC were toddlers. But I don;t think the teen book is especially great, just a rehash of their usual stuff. Still worth reading, though.