William and Mary is a brilliant gem of a short story from Roald Dahl, the master of the sting in the tail.

In William and Mary, Roald Dahl, one of the world's favourite authors, tells a sinister story about the darker side of human nature. Here, a wronged woman takes revenge on her dead husband . . .

William and Mary is taken from the short story collection Kiss Kiss, which includes ten other devious and shocking stories, featuring the wife who pawns the mink coat from her lover with unexpected results; the priceless piece of furniture that is the subject of a deceitful bargain; a husband and wife who hit upon a novel way to feed their baby; and others.
--https://www.penguin.co.uk/books/191983/william-and-mary--a-roald-dahl-short-story-/9781405910927.html