A bit of a plodding, un-mysterious mystery, in which tension is suggested, then not really delivered. There are a few glimpses of period London and some nice atmospheric touches, but save for a spirited performance by the female lead, the acting and characterisations all seem a little flat. The plot doesn’t help – it’s fine, but it’s rather slim and a little predictable. Not a terrible film, but once seen, not really worth revisiting. One or two scenes seem disjointed and the film claustrophobic at times, which is a shame, as a more effective tension would and should have been built and developed. A pleasant-ish way to spend a bit of time, but nothing more.