The Thumb Mark of St. Peter

When her niece's fiancé dies suddenly under suspicious circumstances, Miss Marple is drawn into one of her most personal cases. Rumors of madness, poison, and even strangulation swirl around the quiet English town. The local police dismiss it as heart failure, but Miss Marple knows better.
With only her sharp instincts, a few seemingly minor clues, and a lifetime of observing human nature, she pieces together the truth behind the man's death. What she discovers is more chilling-and more calculated-than anyone suspected.
This short story showcases Miss Marple at her most intuitive and relentless.
Perfect for fans of classic detective fiction, small-town mysteries, and clever female sleuths.