Benched from the team and feeling increasingly victim to his newfound circumstances, Dr. Owen Harper struggles to find his place in the world. Will the lonely girl on the rooftop help him, or will it be a mission to retrieve an alien device that is proving more lethal by the second?

When an old cinema re-opens, past horrors emerge to stalk the streets of Cardiff. As bodies are found caught between life and death, Torchwood must act fast. Who are the Night Travellers and how can Torchwood capture these mysterious killers?