Determined to escape her old life, misfit and student geologist Hallie packs up her life in England and heads to Paris. As a bartender at the notorious Millie's, located next to the Moulin Rouge, she meets Gabriela, who guides her through this strange nocturnal world, and begins to find a new family.
But Millie's is not all that it seems: a bird warns Hallie to get her feathers in order, a mysterious woman shows up claiming to be a chronometrist, and Gabriela is inexplicably unable to leave Paris. Then Hallie discovers a time portal located in the keg room. Over the next nine months, irate customers will be the least of her concerns as she navigates time-faring through the city's turbulent past and future, falling in love, and coming to terms with her own precarious sense of self.