ONCE A SINNER is a B-movie character drama about a love triangle between a very British kind of femme fatale and the two very different men in her lives. Seen today it's a slow and dated affair, quite genteel at times, although it picks up a little in the second half with some more atmospheric and darker elements that make it worthwhile at times. The film flirts with the noir genre at times but other than a handful of scenes is quite routine. It does boast the likes of Thora Hird and Harry Fowler in smaller supporting roles, as well as a very good Sydney Tafler playing a real bad boy.