Opened at the Embassy Theatre in London on 6 December 1930. Murder Mystery. The theft of a devastating new explosive formula and the murder of its inventor presents Hercule Poirot with one of the most puzzling cases of his career. His suspects: a mysterious Italian; a flirty flapper; a genteel spinster; an impecunious son and the enigmatic secretary all have motives. An intriguing mystery worthy of Poirot's 'little grey cells' from the Queen of Crime!