Funny, I didn't realize until I started watching that it's based on the same novel Petzold's PHOENIX derives from, but this is a completely different ride, all mystery-suspense-thriller-over-the-top-drama, and it's a lot of fun to watch this deceptive tale of lust and greed. Ingrid Thulin is riveting and powerful and beautiful as always (obviously). Another lost British gem.
It starts at night, with Ingrid Thulin on a train. There's a young boy. Arriving in a town, she goes to a hotel. Sound familiar? The first third of this film is a Bergmanesque drama. It then morphs into Vertigo-like suspense and then for its final act, becomes a forerunner of Sleuth's murder games. The film has been criticized for this. I think Thompson's control is faultless, stylistically reminding me of Polanski.