The Thumb Mark of St. Peter

In this classic short story, Miss Marple steps in to investigate when her niece is accused of murdering her violent husband.
During the first meeting of the Tuesday Night Club at Miss Jane Marple's home, her guests present real tales of mystery. Miss Marple is the first to share a story . . .
Fifteen years ago, Miss Marple's niece, Mabel Denman, was married to an abusive and hot-tempered man-until he suddenly died. Was it the mushrooms he ate? Or the arsenic Mabel had recently purchased? While the village gossips were ready to declare Mabel guilty, Miss Marple was determined to clear her niece's name and set everything straight . . .
Originally published in the United States in Detective StoryMagazine in 1928, "The Thumb Mark of St. Peter" appeared in Christie's short story collection, The Thirteen Problems, in 1932.