Tras el cristal

but I hasten to add, what the director aims to achieve is neigh unattainable.

In the DVD interview, the director says he was inspired by Georges Bataille and that author's study of Gilles de Rais, the French lord who helped Joan of Arc's campaigns, apparently with exemplary Christian zeal, and who later in life became the world's most notorious torturer and killer of children.

Bataille examines human passion with surgical precision. And he doesn't just analyse: his writings evoke the power chords of 'love' that draw their separate ways sinner and saint.

Villaronga's film falls into 'horror' genre mode at key moments in the story's development. If the director could have depicted his characters' behaviour with sustained realism, his film would , like Bataille's work, tell us more about the nature of evil and be indeed a masterpiece of cinema.

As it is, 'In a Glass Cage' is most beautifully realised with remarkable actors and isn't, finally, altogether a 'horror' film: there's enough realism to give us cause for thought.