In Vesper City, the night belongs to people who operate beyond the law—and to those brave enough to transport what the city wants kept secret.

Josephine "Jo" Calloway is one of the best night drivers in the city. For twelve years, she has lived by a simple rule: move people and packages without asking questions, and never let anyone die in her car. But when an anonymous envelope arrives at the mysterious Window bearing her name and offering four times the usual fare, Jo accepts a dangerous assignment that will change her life.

Her passenger is a frightened accountant carrying an apparently ordinary valise. When armed pursuers ambush them, Jo barely escapes with her life. Her passenger dies, but before his death he reveals that the valise is a decoy and gives Jo a key to a forgotten transit locker containing a secret known as the Ledger—a record of the city's hidden corruption and criminal dealings.

The Ledger could expose Isadora Cruz, the powerful woman known as the Wasp, who has controlled Vesper City's criminal underworld for decades. Determined to recover it, the Wasp sends her people after Jo, making the city's most dangerous driver their newest target.

But Jo is not alone. Bart Lamb and the mysterious members of the Window stand behind her, while Detective Theo Cassel, one of the few honest men left in the city's police department, begins investigating the murder. As Theo gets closer to Jo and the truth, their professional suspicion slowly develops into something far more complicated.

Caught between a corrupt criminal empire, a compromised police force, and secrets powerful enough to destroy the city, Jo must decide whom she can trust. Because the deeper she goes into Vesper City's dangerous night, the clearer it becomes that the real prize is not merely the Ledger—it is control of the city's memory.

And someone is willing to kill to make sure that memory stays buried.