12-year-old Joanna and her 13-year-old brother Peter are spending the first day of the summer holidays at home. All their friends have left, their father was unexpectedly sent on a business trip, and their mother is sick. The guys amuse themselves by watching their new neighbors through the window. They know that this is a family of four, with children around the same age as them. But in the window of a neighboring house, covered with ivy, only three figures flash. In the evening, a phone call is heard, and a girl’s voice asks Peter to urgently come to the house opposite, asks for help... Peter wants to call his sister with him, but she has disappeared! What is happening?! Are the new suspicious neighbors somehow connected with Joanna’s disappearance?