This story appeared in This Week supplements to various American papers, but does not seeem to have been published in Britian.
Sammy Bain tells a story to a group of friends about a rich widow who was robbed of an emerald necklace on an ocean liner. Before the ship's arrival in port, it turns out that the necklace is still in her cabin. Did she fake the robbery? And, for an extra twist, where is the group of friends listening to this story?
This Week, 1 November 1953Included in Crime and Detection, ed. John Higgins.