Half a King
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I've never read anything else by this author, so I can't compare it to his other books, but Half a King wasn't too dark. This book is serious, has plenty of adult characters and it's not what many people imagine when they think of YA. At the same time, it's not too graphic, so you won't need to skip pages if you want to avoid lots of detailed descriptions of blood and violence. There are some, but they're neither long nor many.
We see the plot through Yarvi's eyes, which means that we learn everything at the same time as the main character. It also means that every betrayal is more surprising, because even though we can guess someone's involvement, we can never be completely sure until Yarvi learns the truth.
I'm looking forward to reading the rest of the trilogy. We only get a general idea of the main plot of the whole trilogy in Half a King, but it's clear that what's going on is bigger than what Yarvi -and the reader- thought at the beginning of the book.