Over melodramatic with London portrayed rather gloomily.Dissapointing for a Lancaster film.Newton relishing overacting as a villian & Fontaine rather meek.Unrealistic ending.
You might think this seems interesting, given its lurid title, cast and setting, but I'm here to assure you that it's not. Like other famous big budget stinkers - Goldcrest's 'Revolution' or Hitchcock's 'Under Capricorn' - the problem was precisely that the script didn't come through a major studio. The latter had a long process of developing stories and scripts and it's rare to find something as bad as this from e.g. MGM or Columbia (though maybe a bit more likely from the Poverty Row producers).
Burt Lancaster produced it - it was his first film as a producer - and wanted a role to show his physicality - which it does - and then didn't apply his mind to the rest. Basically, there's no motivation for anything here; and no plot to speak of. Characters just do what they want at the moment. It's all happenstance, from the opening fight/encounter onwards. Awfully thin unsatisfying stuff, which even a decent director and DP's noir touches can't hide.