Cual Copa de Cristal

That's the advice that doctor Brefni O'Rorke (Dr Farrell) gives to surgeon James Mason (Joyce) when giving an analogy comparing insanity to an upturned glass balancing on a mantelpiece. So, that's exactly what Mason does! The film is told in flashback as Mason narrates a lecture to students on the topic of the criminal mind. He presents a case of a sane man committing murder. It's no revelation to the film audience that he is recounting his own story. What is interesting in this technique is that we realize he hasn't actually carried out the act and we then find ourselves in real time at the end of the lecture as he goes ahead with his plan after what can be seen as his confession to the students.

The root of his problem is a love affair with Rosamund Wright (Emma) which cannot be. The ending of the relationship coincides with some tragic news and Mason then turns to Pamela Mason (Kate) to discover the truth and exact revenge. The real events of the tragedy are never fully confirmed and so Mason's actions are very suspect. Is he insane? He certainly seems to be acting on a whim. Pamela Mason is excellent in her role and certainly had me rooting for her. I'm not sure this was the intention, though!

The young girl whose sight Mason saves at the beginning of the film is played by Ann Stephens who died aged 35 in 1966. I can't find any details on how she died. Can anyone help on this? It would be interesting to know. She delivers some amusing dialogue about not liking her hair and Pamela Mason's dialogue regarding her is flippantly wonderful – I'll send her boarding – ha ha. The best of us have all spent time boarding as a child. As for the film's title, I still don't know what an upturned glass means? Which way?