The latest Masterpiece series of new adaptations of works by Agatha Christie made its debut last night on PBS and will continue to air Sunday nights through July 10. Three of the shows star David Suchet as Hercule Poirot and the last stars Julia McKenzie as Miss Marple. Fans can go to PBS's Agatha Christie Book & Film Club, which offers discussions, questions, activities, a "delicious death" recipe, the episodes themselves and a perspective on Christie from her grandson, Mathew Prichard.