This Emlyn Williams play about the relentless search for truth intertwines craftily in and out of the lives of some very imperfect human beings and builds to a surprising but inevitable ending.
Redgrave, McKern, Todd, Plowright, Maxwell, Daneman and the rest of the cast all do well to bring this gritty black and white puzzle into focus. The son played by Alec McGowen was a bit over-the-top at times but then his character's madness required that.
It's not a masterpiece...but I don't expect there are too many of those around. But what it does provide in dramatic tension elicits interest and compassion from the viewer until the very end.
The Tristram Cary music must be cited here for its unflinching power to shake us up and take notice of the action on the screen. If there is any masterful work here it is the music.
The only qualm was the less-than-satisfying editing which tended to bring the down the tension-building instead of heightening it.
Yes, it was a low-budget movie...it's a cop-out to say that in view of the fine acting of the magnificent cast which redeemed it many times over.
I'd recommend this to fans of film-noir, classic thrillers, mysteries and the British cinema.