Amy Black, a queer single mother and an aspiring artist in love with calligraphy, dreams of a coveted artist's residency at the world's largest social media company, Q. One ink-black October night, when the power is out in the hills of Oakland, California, a stranger asks Amy to transcribe a love letter for him. When the stranger suddenly disappears, Amy's search for the letter's recipient leads her straight to Q and the most beautiful illuminated manuscript she has ever seen, the Codex Argentus, hidden away in Q's Library of Books That Don't Exist--and to a group of data privacy vigilantes who want her to burn Q to the ground.

Amy's curiosity becomes her salvation, as she's drawn closer and closer to the secret societies and crackpot philosophers that haunt the city's abandoned warehouses and defunct train depots. All of it leads to an opportunity of a lifetime: an artist's residency deep in the holographic halls of Q headquarters. It's a dream come true--so long as she follows Q's rules.