In early May 1932, a woman in Stockholm went to the police because she had not heard from her friend Lilly Lindestrom for several days. The two lived in the same building in the Atlas district, near Sankt Eriksplan. Officers opened Lindestrom's flat on May 4 and found her dead on her bed. She was in her early thirties and worked as a prostitute. She had been killed by blows to the head and had been dead for days. What made the case notorious was the condition of the body, which had been drained of blood, and a ladle found at the scene that police believed the killer had used to drink it. Swedish newspapers began calling the unknown man the Atlas Vampire. Detectives questioned men known to have visited the flat and followed leads for years. Other residents of the building had heard nothing unusual. Fingerprints and the few traces left behind led nowhere. No one was ever charged. Material from the investigation, including hair samples and crime scene sketches, is held by the Stockholm police museum. More than ninety years later, the killing of Lilly Lindestrom is still the best-known unsolved murder in Sweden. The creepiest photos ever taken: