Three Silent Men (1940)

Three Silent Men (1940) is a Thomas Bentley directed pacifist surgeon and deadly weapon of war early nuclear threat war-themed innocent man accused of murder mystery courtroom largely farcical semi-serious pre-War style but intra-War produced drama noir low budget thriller intriguer, directed by Thomas Bentley and starring Sebastian Shaw, Derrick De Marney, Patricia Roc and Arthur Hambling, written by Jack Byrd and Dudley Leslie.

Circle of Danger (1951)

The Ray Milland Season Unfolds Without Haste

Circle of Danger (1951) is an American in Britain post-WW2 investigative mystery Limey home nations road movie of mystery with locale-driven shooting in London, Wales and in the Highlands, making a virtue of Patricia Roc's infectious smile and Ray Milland's hatted and haunted pillar to post look as he uncovers a vaguely understandable plot that I am not sure now after two viewings — has ever been explained. 

The circle itself, the circle of danger, the rotunda of peril, is specifically not quite as convoluted as it might otherwise be in a film noir.