When mysterious portals begin tearing open across the world, battle-worn warrior Sam Walker is called back into service. Behind the chaos stands Azryel, a fallen angel gathering ancient titans to wage war against humanity and Heaven itself. Protected by celestial warriors and empowered by the Son, Sam must confront enemies beyond mortal understanding while fighting to protect his family and his faith. But Azryel is only a weapon in the hands of an even darker power. As Earth becomes the battlefield of an eternal conflict, Sam discovers that victory will depend not on his own strength, but on the divine power working through him.