Houses of worship are burning all across the U.S., churches, synagogues and mosques alike. Usually while the places are full of people. The fires are initially dismissed as unconnected, random acts of violence, until Morris - freshly released from jail after their last case - and Chastain track down the terrible meaning behind the destruction, and the dark cause the arsonists seek to serve. A race against time ensues, to stop a ritual that will cause the deaths of hundreds... and bring about the end of the world.