Question: What is the name of the French folktale that the serial killer covered by Webb Miller is said to have been a real-life version of? 
Sentence (from "Henri Désiré Landru"): Henri Désiré Landru (April 12, 1869 – February 25, 1922) (] ) was a French serial killer and real-life "Bluebeard".
Relevant evidence: Yes