Penny Dreadful: City of Angels (season 1)

No one suspected that one day a real madman would appear in the vicinity, with more than two dozen victims on his account. This person doesn't know mercy and compassion. For the sake of realizing his terrible desires he is ready to make any sacrifice. People are starting to be afraid to go outside their homes. Seeing no other way out the authorities turn to two well-established police detectives.