Murder travel

A six-pointed star drawn with clotted blood on a wall opposite the door of a room whose contents are scattered, and there is the corpse of a young woman in her mid-twenties whose skin was skinned before she was slaughtered with a sharp blade that passed slowly until it finished around her neck, lying on the ground in the middle of the room, nothing indicating the perpetrator of the crime, nothing. Except for a black book and those scattered papers and pictures bearing incomprehensible words...