Berlin. Late Saturday evening. Jules Tannberg is filling in for a friend at a telephone support service for people who feel anxious about returning home at night and want someone to stay in touch with them, reassure them, and call for help in case of danger. Since leaving the emergency services, Jules has not encountered any life-threatening situations. Until today's conversation with Clara. The young woman is terrified. She believes she is being stalked by a psychopath who has already attacked her and written the date of her death in blood on the wall. And that day is about to come...