Go To Sleep

There have been many murders in Angelica Town, the murderers kept killing kids to adults. Then one day they stopped, left a picture in the last murder, detectives figured out that the murderers are living in a mansion, located in the dark middle side of a forest, many detectives have gone there but they never returned, the case kept growing and they kept sending detectives, but still.. they didn't returned. And at the end they chooses YOU now.. can you solve this case?