Face Of Fear by C. Marry Hultman
Racine, Wisconsin, the 1950s.
When several mutilated bodies of thugs are found in a parking structure downtown, Detective Garfield Teague suspects that it is something other than a drop off gone wrong. His suspicions are confirmed when details arise regarding a sword- wielding vigilante seemingly with the same objective as the police; finding the clandestine criminal organization known as The Black Diamond. With every lead a dead end, and each clue creating a more sinister tableau, Teague must ask himself two questions. Who is flooding the streets with cocaine, and who stalks the night wearing terrifying mask of fear?
Hultman is an American currently living in Sweden.