Petra: Messengers of darkness

After appearing on a television program, Petra receives a package at the police station. Inside, preserved in a jar of formalin, is a surgically severed penis and a clue to decipher. Is it a threat or a dramatic cry for help? In the following days, more packages and new clues arrive. Petra and Antonio must enlist the help of Egor, a charming policeman recently arrived from Moscow, to solve a nightmarish puzzle.