Paris, 1885: Aubry Tourvel, a spoiled and stubborn nine-year-old girl, come across a wooden puzzle ball on her walk home from school. She tosses it over the fence, only to find it in her satchel that evening. Days later, at the family dinner table, she is stricken by a mysterious illness.

When a visit to a doctor only makes her worse, she flees to the outskirts of the city, where she discovers it is this very act of movement that keeps her alive. So begins her incredible lifelong journey on the run from her condition.

From the scorched dunes of the Calanshio Sand Sea, to the snow-packed peaks of the Himalayas; from a bottomless well in a Parisian courtyard, to the shelves of an infinite underground library, we follow Aubry as she learns what it takes to survive and, ultimately, to truly live. But the longer she wanders, the more she understands that the world she travels through may not be quite the same as everyone else’s…