Charles Morgan

A ruthless crook abducts the wife and child of a bank manager and then masquerades as an insurance company detective while scheming to rob the institution in this crime drama. Unfortunately, some of the manager's employees learn about the plot and the terrified manager must beg them to remain silent. Fortunately, the cops have been on the case all along. (imdb)

Victorian era, 'Who done it' with the venerable Sergeant Cork battling entrenched views in a bid to use a more scientific approach to solving cases.Trusty sidekick Bob does not always understand his methods but faithfully co-operates.