Ever wonder if you could relive part of your life, to experience again the innocence of childhood or to correct a grievous mistake that has haunted you? Mack McCoy may have done just that unwittingly. Mack is a good man, captain in the Dallas Police Department who would describe his career as "in the weeds," thanks mainly to an incident in which he shot and killed two unarmed teenagers in the act of robbing a pizza restaurant. Though cleared of wrongdoing, he has become a pariah, busted back to captain from deputy chief. Mack is paired with a fire captain for a project they both perceived as dead-end with no potential growth for either of them and more importantly, no redemption for Mack. Just as it seems things couldn't get any worse, they do. A violent traffic accident kills Mack's best friend and leaves Mack fighting for his life. Through recovery, Mack begins to realize there are certain realities in his life that are quite different from the way he remembers them. People begin walking into his life that had passed or played a completely different roll in his life in the past. New people such as a homeless man and other unknowns that come and go in the shadows and call themselves "advocates" also become a part of his new reality. What happened to Mack while in surgery, and what childhood event could be a gateway that changed everything? No one expects a "Do-Over" in life. Mack didn't expect it. The question is, did he take it?