Once finding out he is immortal, Matthew Walker is thrust into an underground world of supernatural beings, betrayals, and plots to use him or take his life. Matthew must navigate these new, powerful forces with the help of the Ancient organization - the Assembly of Immortals. In the aftermath of the Postman in Atlanta, Richard's life is thrown into further upheaval and danger. Valerie and Shade run from the authorities, the mob, and their connected pasts. And Marcus finds himself in the hands of the mysterious Mr. Smith, an immortal who believes he is a god and should rule the earth, mortal and immortal alike. Matthew must decide whether to use his new power to return and help his friends survive or step into his destiny among the Assembly as an underground war threatens the world of the supernatural.