Seventeen year old twins, Alex and Caleb, left their family and their authoritarian encampment that has been living in isolation for over fifty years. Are there any great cities left behind from the wars, floods, fires and destruction of the past or is there nothing out there to find? Will leaving their lives and loved ones be worth it? The fourth and final book of the Defiant series. A 50, 000 word YA dystopian novel for lovers of the Divergent and Hunger Games.