HekArtemis
And it is interesting how Melanie's sections are written more simply, with a child's innocent and non-elaborative voice. The book starts with that almost childish writing style, don't be turned off by it as it is deliberate and not the only voice in the book. Her voice matures a little as time passes as well.
Definitely recommend if you're looking for a zombie, plague, or post-apocalyptic book. Or a book that delves into morals in an interesting way.