No criminal can outwit Detective Hercule Poirot’s “little gray cells” as he investigates the seemingly mundane death of a country squire.  The second short story from Agatha Christie’s collection Poirot Investigates the mystery of “The Tragedy at Marsdon Manor” features performances by acclaimed DC actor, David Bryan Jackson, with musical renditions of Irving Berlin’s classic “Puttin’ on the Ritz,” by jazz trumpeter Markus Rutz and his collaborator on the keys, Adrian Ruiz.