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 "Charles Cullen"): But in subsequent interviews with police, psychiatric professionals, and journalists Charles Graeber and Steve Kroft, it became clear that he had killed many more, whom he could not specifically remember by name, though he could often remember details of their case.
Relevant evidence: No