Chicago, 1893. Henry Walter has spent three years building a machine that can think—and three years listening to it whisper his dead wife's voice through the static. He is failing. He is alone. He has given up on being understood.
Agnes Raymond arrives in his workshop wearing widow's silk and the careful mask of a woman who has forgotten how to feel. A mathematician trapped by duty, she is sent to audit his work. Instead, she finds a flawed equation that sings with genius—and a man whose obsession mirrors her own desperate hunger for purpose.
She gives him the numbers he needs.
He gives her the one thing she never expected: to be truly seen.
As the White City blazes with electric wonder, Henry and Agnes build something far more dangerous than a machine. They build a language only they can speak—a current that crackles between them like the lightning they are learning to command.
But the syndicate that funds Henry's work sees their creation as a threat. Agnes's father, the most powerful man in Chicago, will do anything to tear them apart. And when the world they've built begins to burn, Henry and Agnes must choose:
Protect the machine that speaks for them—
Or protect the love that speaks through them.
Because some connections cannot be patented.
Some currents cannot be controlled.
And some sparks change everything.
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He built a mind. She gave it a soul. Together, they discovered the most dangerous language of all—the language of two hearts learning to speak as one.
