I stumbled across this on Betamax video at my local video rental library over 20 years ago and have wanted to see it again ever since. A really well scripted and acted movie which takes you gently by the hand and leads you in deeper and deeper until the denouement turns your world on its head. I don't know why it wasn't more succesful or highly rated at the time. Richard Burton is as always masterful and a huge screen presence. Don't expect car chases or lots of action - this is an intelligent thriller which relies on characters for its grip of you.