When the most valuable power source on the planet is the human soul, protecting humanity is more than an essential service. Arturo Morales, a supernatural hybrid known as a sentinel, has spent half a century fighting in the shadows to protect those souls and keep the supernatural world cloaked from humanity. This is only worsened when the warring elements of Arturo's heritage vie for control of his increasingly fragile mind, all to the backdrop of a modern day St. Louis torn by terror attacks. With the clock ticking, Arturo and his fellow sentinel team must find the terrorists hidden within the community, while combatting deep-seated prejudices that cloud fact and fiction and threaten the very fabric of the world.