A series of seemingly unconnected murders takes place in London, with the murderer leaving a calling card signed "The Marquess". Aspiring novelist and amateur detective Paul Temple and his wife Steve are called in to investigate.
John Bentley ... Paul Temple Patricia Dainton ... Steve Temple Grey Blake ... Storey Peter Gawthorne ... Sir Graham Forbes Valentine Dyall ... Superintendent Bradley Robert Urquhart ... Slater Christopher Lee ... Sir Felix Raybourne Dan Jackson ... Sakki Ronald Leigh-Hunt ... Inspector Ross Arthur Hill ... Cranmer Guest Ben Williams ... Reddy Carson
