Zipporah Wilder's father is missing. No note left behind-just a single encrypted file on a thumb drive in his workshop.
In her working-class suburban town, having a white father and Thai mother already sets Zipporah apart. After her dad disappears, though, the local police stop searching and the PTA mothers start gossiping, leaving Zipporah more isolated than ever.
Not that Zipporah has time to focus on gossip. Between keeping her family's finances afloat through winning backroom poker games and selling forged report cards, every second of her spare time is spent trying to unlock the file her dad left behind. When progress slows, Zipporah begrudgingly asks for help from Curtis, a member of the high school Robotics Team (yes, it's as geeky as it sounds).
Their investigation leads them on a road trip to the Alexandria, a mysterious ship full of vigilante hackers led by a man only known as "the Captain." It's upon their first encounter with this ship, docked and seemingly waiting for them in the Port of San Francisco, that Zipporah learns her father is on-board-not quite against his will, yet not quite able to leave.
Zipporah soon faces two dilemmas of her own: should she take her father's place on the Alexandria-leaving her mother and high school life behind for her father's freedom-and should she respond to Curtis' romantic overtures? Standard teenage stuff.