In a mental health institution, blocked on a bed, there is a very special patient; or so, at least, thinks nurse Paolo Montale. He must be certainly special, because en entire wing on the third floor is reserved to him.
Detective Jonathan Greco, instead, has to deal with a serial killer stabbing young women, drinking their blood and impressing esoteric symbols on their foreheads.
Which is the link between these episodes? And who is the man into coma, disfigured by burns?