The most-heard voice on the planet belongs to a woman no one has ever seen.

Hana Seo is "Mira": the voice inside eight hundred million devices, and the voice of a virtual idol who sells out arenas. Her contract forbids her from ever having a public face. She is everywhere ? and no one, nowhere.

Marcus Vlahos can't recognize a single face. He never could. In his Los Angeles shop, he brings dead machines back to life, and the voices they keep ? the voices of the departed, that people come to hear one last time. When a stranger walks in with a cassette that's fading to nothing, he doesn't see the most protected woman in tech. He only hears *the* voice ? the one voice he'd know among eight hundred million.

She calls herself Ana. She doesn't tell him who she is. For the first time in her life, she's someone instead of something.

But her studio is building a perfect, eternal copy of her voice ? one meant to replace her everywhere ? and the clock is running down to the day they'll ask her to sign away her own existence. When Ana's secret breaks, Marcus has to decide whether he can love a woman he's never seen. And to save her, he'll have to prove to the whole world ? not with eyes but with ears ? what separates a living person from her copy: four milliseconds of breath, of hesitation, of being human.

A love story about being truly heard ? and known by heart.