A new Civil War is brewing. With the city of Bewelcome as its headquarters, Allan Pinkerton's Detective Agency leads a siege on Hex City, the town founded by "Reverend" Asher Rook and his consort, the Mayan goddess Ixchel. Monsters prowl the battleground, rocket trails of spells crisscross the sky, and an unnatural rain falls.

Sides must be taken, but Pinkerton-agent-turned-outlaw Ed Morrow, spiritualist Yancey Kloves, and even Rook must choose what ruin or redemption means to each of them. Meanwhile, Chess Pargeter gears up for the greatest fight of his life—and death. A battle out of hell itself ...