When Mara Voss inherits a mysterious atlas from her estranged, recently deceased father, she discovers it isn't a normal map collection. It's a catalog of impossible places — a lake that reflects the past, a forest larger on the inside than outside, a sunken city frozen in an eternal present. Following her father's obsessive field notes across the world, Mara uncovers the truth: these aren't accidents of nature. Someone built them. And something ancient has been tending them ever since. The atlas was never just her father's life's work. It was always meant for her.