As another reviewer on this site has noted, THE NARROWING CIRCLE is a somewhat disappointing B-movie thriller. Compared to other films of the genre from this era - like OPERATION DIPLOMAT, say, or even the cheapie Butcher Films movies of the early '60s - it feels sloppily written in places, and as a mystery it cheats the viewer by preventing them from being able to guess the identity of the villain thanks to some mediocre writing.
Paul Carpenter essays the role of an unsympathetic writer for the pulp magazines who finds himself framed for murder by persons unknown. The only ally he has on his side to help him is the pretty Hazel Court, a year before she hit the horror big time with Hammer's THE CURSE OF FRANKENSTEIN. Together the pair move through a plot involving detectives, multiple murder, and a rather convoluted back story with more than a few plot holes if you look too closely.
THE NARROWING CIRCLE features the likes of Ferdy Mayne, Basil Dignam, and Hugh Latimer in support. Trevor Reid is very good as the acerbic detective and gets all the funniest lines. Carpenter feels pretty wooden and there's a bit of a vacuum where his character is involved. The film was directed by B-movie specialist Charles Saunders (WOMANEATER) and made by Fortress Films, who put out 8 B-movies during the 1950s before disappearing into obscurity.