Returning to her home, she phones Mark telling him to come and asks a neighbour, Carlo, to keep her company. The lights go out and both Sara and Carlo are stabbed to death by a gloved killer. Mark discovers the bodies and two torn fragments from Rose's letter. After the police arrive, he walks out of Sara's apartment and sees a taxi slowly driving by. In the back seat of the vehicle is the music student, staring at him intently. Mark telephones Rose and promises to visit, but the phone call is cut short. Rose sees two shadowy figures preparing to enter her apartment. She leaves through a back door, but is followed. Running into a decrepit laboratory, she is grabbed by a clawed assailant and guillotined with the glass of a broken window.