This is a most enjoyable film classic in the vintage 1940s tradition. The opening segment, as the credits fade out against the backdrop of a cold, dark, night correlate with the sense of mystery and intrigue suggested in the title. There's something warm and inviting, here for the aficionado.
Although shot in 1947, the film has a familiar Dickensian feel to it; there's the antique store that features as the central setting (shades of "The Old Curiosity Shop"), there's Kenneth Griffith who lurks ominously like Uriah Heep (from "David Copperfield" and Kathleen Harrison, that perennial favourite, is the archetypal Victorian housekeeper. Muriel Pavlow's character, although not fully explored, has some resemblance to a Dickensian heroine.
Thickly moustachioed, Oskar Homolka (cigar-puffing, piercing eyes and busy eyebrows), in the role of protagonist, delivers a masterful performance (can one ever forget him after watching him in whichever role he plays?). He and Griffith are the driving forces that propel this absorbing drama. For one relatively new to acting, Griffith delivers a convincing performance. Beneath the superficial layer of criminal activity, the film goes deeper to touch on, among other issues, the nature of evil which in Griffith's case appears to be an inherent trait. In the case of Homolka: is he a tragic figure, does he evoke a sense of pathos, does he earn our sympathy? These are some of the questions which the view faces at the film unfolds.
The 1940s was the highpoint in British cinema and it's not difficult to see why this film is so highly rated in the canon.
PS: If you are a lover of classical music, you will enjoy a bonus!