In a city where the architecture breathes and the gears are fueled by human memory, Kaelen is a man who trusts only what he can touch: brass, steel, and the honest click of a tumbler. A locksmith of the Sinks, he lives by the code that every lock is a question, and every key is an answer. But when a mysterious stranger leaves a vibrating bronze sphere on his workbench, Kaelen is pulled into the Clockwork Spine—the hidden, mechanical heart of a metropolis that is literally seizing up under the weight of its own secrets.
