Cecil Parker is the whole show in Dear Mr. Prohack, just as he'd been in the stage version by Edward Knoblock. The eponymous Prohack is a Royal Treasury official who is an expert at managing other people's money. Alas, when he himself inherits a fortune, Prohack is as financially naïve as a kid with a piggy bank. Denholm Elliot makes his film debut in the role of Ozzie Morfrey; others in the high-powered cast include Glynis Johns, Dirk Bogarde, Hermione Baddely, Ian Carmichael, future director Bryan Forbes, and Jon "Dr. Who" Pertwee. Both the play and film versions of Dear Mr. Prohack were based on a novel by Arnold Bennett.