Port Talbot Parkway, a train station in the heart of one of South Wales' most famous industrial towns. A town full of colourful characters, including two sisters, Carol and Janice, who indulge in their hobby of people watching on the station's platform, watching people coming and going. All is normal, until things don't add up for Carol, who is left with a headache. She is sure something odd is happening around her, but what that is, is a mystery.