Mary Greene is the only identified victim of Leng's from his laboratory in Shottum's Cabinet of Natural Productions and Curiosities. Mary was a prostitute who sold her body in order to care for her two younger siblings after the death of their parents. Mary was arrested and placed in a workhouse near Shottum's Cabinet. It is here that Mary met her killer. During her time in captivity, Nora Kelly believes she wrote her name and address on a piece of paper and sewed it into a patch on her dress in order to prevent dying nameless. It is Mary who inspires Nora to continue investigating these murders.