Watch Cold Case Files Online at Couchtuner. The return of Cold Case Files will explore compelling new cases that have gone cold for years and chronicle the journeys of the detectives who reopened them. The detectives relive the events of the crimes, reveal new twists and startling revelations for full viewer immersion into these tragic cases, relying on breakthroughs in forensic technology and the influence of social media to help crack these cases – bringing long-awaited closure to the victim’s families and friends.