I love Agatha Christie mysteries. After mastering the adventurous Hardy Boys and the magical Holmes, I fell in love as a child with the cool, considering Poirot and the keen, canny Miss Marple. As an adult, I love Christie’s mysteries not only for their entertainment but for how she writes about class and English society. Her novels are little slices of a time that no longer (if ever it did) exist, one populated by quaint…