I'm not typically a fan of horror, zombies, or books that mess with my emotions as broadly as this book did. That being said, all four books in this series where addictive, well written, kept me guessing, and thoroughly had me on edge in one way or another.
The author of Until the End of the World, Sarah Lyons Fleming, has a way with words that is not only unique but makes her one of the better authors I've discovered in 2015. If you choose to listen to this series instead of read it, the Audible version read by Julia Whelan is an excellent choice. She adds to the characters with her tone, pitch, and pauses.