When the mad conqueror haunting Elaina’s dreams invades her adopted homeland, the real nightmare becomes what she’s willing to do to stop him. The dreaded Hunter Baron has landed on the shores of Mailderet, but Master Tinkerer Elaina Gable believes she has the solution. Giant automatons sit rusting in the valley, waiting for someone with the drive and ingenuity to bring them to life. But the king, swayed by the destruction his ancestors wrought centuries before, harbors a deep-seated fear of the machines. Though he will not allow the alliance of Tinkerers and Smiths to complete the work, Elaina resolves to bring the machines back to life in secret—with the help of a famous airship pilot. From the safety of the swamps, a woman with silver skin jealously guards the secrets of the automatons. Though the Silver Woman also wishes the past to remain buried, she must weigh the value of secrecy against the thousands of innocents her hesitation might send to the grave. As they discover the link between the toxic valley and the inner workings of the automatons, Elaina and her allies are drawn into a web of deceit threatening the balance of power across two continents—and proving the truth behind the deadly legends surrounding the Army of Brass.