The Iron Tithe

"We are the weight on the lid. And we are not moving."

The Broken Vow Mysteries comes to its shattering conclusion.

The Alchemical Wars have ravaged the north. The Silver Knights are broken, their crusade stalled by the winter snows. High in the Cheviots, Cyprian and Rowan have found a fragile peace among the ruins.

But silence is deceptive. A vibration is rising from the deep earth-a hum that Rowan feels in her iron bones. The ancient "Matins" protocol has been reactivated.

Cyprian discovers that his tower sits atop the "Tithe Barn"-a subterranean city where the Watchers' ancestors tried to transmute humanity into perfection. Now, the factory floor is moving again, churning out an army of glass and brass that cannot be killed by steel.

From the freezing peaks of the Razor to the molten rivers of the Underworld, the Mason and the Iron Warden must fight their way to the heart of the machine. But to stop the gears from turning, they will have to sacrifice the one thing they fought so hard to build.

The Vespers are silent. The Matins are sung. Now, the long watch begins.