All Our Yesterdays by Cristin Terrill

Title: All Our Yesterdays (All Our Yesterdays #1)

Author: Cristin Terrill
360 pages, September 3rd 2013, Disney Hyperion

Goodreads' synopsis: "What would you change?

Imprisoned in the heart of a secret military base, Em has nothing except the voice of the boy in the cell next door and the list of instructions she finds taped inside the drain.

Only Em can complete the final instruction. She’s tried everything to prevent the creation of a time machine that will tear the world apart. She holds the proof: a list she has never seen before, written in her own hand. Each failed attempt in the past has led her to the same terrible present—imprisoned and tortured by a sadistic man called the doctor while war rages outside.

Marina has loved her best friend, James, since they were children. A gorgeous, introverted science prodigy from one of America’s most famous families, James finally seems to be seeing Marina in a new way, too. But on one disastrous night, James’s life crumbles, and with it, Marina’s hopes for their future. Marina will protect James, no matter what. Even if it means opening her eyes to a truth so terrible that she may not survive it... at least, not as the girl she once was. Em and Marina are in a race against time that only one of them can win."

I just love time travel books, every single one of them has a different idea or theory of how it works, and it's just SO fascinating to me. In this book Cristin Terrill actually considers paradoxes, which I haven't seen all that much of, and I really liked her idea.
Also, this is one of those rare books where I changed my opinion of what guy in the love triangle, the girl should be with, which I wasn't too happy about in the beginning, because I hated that the people turned out to be someone different from what I originally thought, but you know, now it's fine. 

This book also had great character development, even people you just heard about or 'met' real quick felt like real people, which always helps me get into the book more. The story is told by alternating protagonists, Em and Marina.
It's not the usual teen book, and I was surprised many times throughout the book. It had a lot of excitement, even in some of the first chapters. It was a page turner and I found that it was really hard to put it down. 

Hyperion | Cristin Terrill

ABOUT THE AUTHOR

Cristin Terrill is a young adult author and aspiring grown-up. She grew up semi-nomadic and graduated from Vassar College with a degree in drama. After getting her masters in Shakespeare Studies from the Shakespeare Institute in Stratford-upon-Avon, she lived in London, Austin, Boston, and Washington, DC while working as a theatrical stage manager. Now she writes and leads creative writing workshops for DC-area kids and teens. All Our Yesterdays is her first novel.