This Thriller series was made for British television back in the 70's. There are 6 seasons with 10 episodes in each. I'm enjoying them because I've never seen them before. I don't think they aired in the US. They're written well and acted well too. What's cool is you recognize some of the old actors both British and American when they young. Another quirky thing is the 1970's attempt at technical scares is hilarious. Sometimes I enjoy the simplicity of television back in the day. Something worth checking out for the 70's generation.