Peaceful Because the Definition of Serenity is The state of being calm, peaceful, and untroubled.
You can exactly expect what it says “Death”. You can expect the book to be about being in the pov of death, but death could mean lots of things in the book it could be about death after life or death what happens when you die or how does death feel like. From a book narrated by Death you can expect to know how death is.
Yes, according to me whatever Kezia's dad did was right as anyone would get angry if someone destroys their hard work. But still, Kezia had done it unknowingly, so the punishment meted out to her was severe and harsh and it can also be seen that Kezia had done it out of love for her dad. So there is a point at each side so no one is at fault.
Hope it helps you.