Mara Venn works the night desk at the Lumaire Civic Archive, where maps are locked in climate glass and every corridor is measured twice. When a ledger turns into a street plan under lantern light, Mara discovers that the city's missing poets have been hiding routes through its shifting districts. This updated Night Index edition follows Mara deeper into the archive's forbidden catalog, where each borrowed street asks for a price before it can be remembered. The more she maps, the more the city resists being made whole. The Cartographer's Lantern is a literary fantasy mystery about memory, municipal power, and the stubborn human need to name the places that made us.