Long ago, in place forgotten in time, humans were a mere shadow of the creatures they are today. They were defenseless and kept at the mercy of those who controlled their world. Sustain follows the life of the most powerful Kastelian family of that age. Cole, the oldest of three sons, was a strong, handsome man born into privilege, power and hatred. Raised by his merciless father, Corwin, a self-proclaimed king and proud leader of the Kastelians, he was a key player in his father's plan to annihilate their adversary. Cole's life takes a sharp turn when he meets Arna, a beautiful and powerful woman who brings him on a journey of courage, suffering and hope that will forever change his life.