In January 2314, Rowena Savalas—a curator of the vast archive of the twenty-first century's primitive internet—stumbles upon a story posted in the summer of 2024. She's quickly drawn into the mystery of the text: Is it autobiography, fantasy, or fraud? What's the significance of the recurring number 381?

Mathematician Lakshmi Nayak receives a letter from her future self about faster-than-light travel. The equations work, and the letter itself seems to prove the possibility will someday be realized. But her paper on the topic is fiercely criticized, and she's warned away by a sinister Alliance agent. After defecting to the Union, she gets an unexpected offer: "I can build your ship." Shipbuilder John Grant learns of a secret project, which unknown to the world has been traveling to the stars for decades: Black Horizon.

There's only one thing notorious thief Lyta loves more than a big score: her little brother, Kit. But when Kit is arrested for producing seditious pamphlets, he stands to lose not only his printing press, but possibly his life. In exchange for her brother's freedom, Lyta strikes a daring bargain with the king -she will steal the infamous Book of Gold: a mysterious manuscript reputed to be hiding vast magical power within.

Mossa has returned to Valdegeld on a missing persons case, for which she’ll once again need Pleiti’s insight. Seventeen students and staff members have disappeared from Valdegeld University—yet no one has noticed. The answers to this case may lie on the moon of Io—Mossa’s home—and the history of Jupiter’s original settlements during humanity’s exodus from Earth. But Pleiti’s faith in her life’s work as a scholar of the past has grown precarious, and this new case threatens to further destabilize her dreams for humanity’s future, as well as her own.

The Pandominion: a political and trading alliance of a million worlds–except that they’re really just the one world, Earth, in many different realities. And when an AI threat arises that could destroy everything the Pandominion has built, they'll eradicate it by whatever means necessary, no matter the cost to human life.