If Merouac ever thought his life's work would culminate in leading the metal workshops of the Transcontinental Railroad Project, he was sorely mistaken. Now, his true challenge lies in navigating the other-worldly abilities he's only beginning to understand-abilities that allow him to tune metal to interdimensional frequencies. While trying to be a guardian to his niece, Evra, he's realising she may have more to teach him than he ever expected. At the same time, his decision to help an interdimensional race find refuge underground puts him at the centre of an even deeper mystery. As reality reshapes itself around him, Merouac faces a growing realisation: the world of Ahm is on the brink of a profound transformation, and everything he thought he knew may soon be shattered.