For nearly a century, Victorian London relied on “climbing boys”—orphans owned by chimney sweeps—to clean flues and protect homes from fire. The work was hard, thankless, and brutally dangerous. Eleven-year-old Nan Sparrow is quite possibly the best climber who ever lived—and a girl. With her wits and will, she’s managed to beat the deadly odds time and time again. But when Nan gets stuck in a deadly chimney fire, she fears