Mother-of-two Audrey is horrified when during a moment of distraction in the park, her pram with baby Wilfred in it roll down the hill and into a pond. Fortunately for her, Claire Jones is nearby and rescues Wilfred, soothing Audrey and daughter Antonia with coffee and cake in a nearby café. Audrey and Claire quickly become friends but the frightening experience has dented Audrey's confidence and she replays the events over and over, convinced she can't have forgotten to put the brake on. To make matters worse she keeps spotting a man in the shadows and becomes sure that someone is stalking her. Does Claire know more than she is letting on?