In the late 19th century, families fell mysteriously ill in their own homes. Children were pale and constantly exhausted. Mothers felt relief the moment they stepped outside. Doctors were baffled—until one Michigan physician looked closer at the walls.

Robert Kedzie discovered that bright green wallpaper, all the rage in Victorian homes, contained arsenic. As the paper aged, tiny particles flaked into the air, contaminating bedrooms and nurseries. His shocking findings were preserved in Shadows from the Walls of Death, a book so toxic that libraries destroyed most copies to protect staff.

This episode traces the strange and deadly intersection of fashion, chemistry, and domestic life. Some of these wallpapers survive today, sealed behind glass, a reminder that danger sometimes hides where we least expect it—in the very walls we call home.