Mrs Pym of Scotland Yard (1940)

A rather outlandish crime drama, this one. Mary Clare ("Mrs Pym") is clearly having fun as a rather oddball detective brought in, reluctantly, by her rather misogynist superiors at Scotland Yard to investigate a series of grisly murders. After a while she detects that we are essentially looking at a case of murder by Hoover (the thing, not J. Edgar) and we set off with her for an hour of light and fluffy detective antics. It has all the depth of a saucer and the accompanying performances add little; but it's still an engaging little thriller worth a glance.