The Gentleman Dressed in Newspaper is a short story written by Agatha Christie which was first published in The Sketch in October 1924.
During a lull in business, Tommy and Tuppence amuse themselves by perusing the paper's personal columns. One cryptic ad reads, 'Three hearts … 12 tricks … Ace of Spades … finesse the King.' Tommy is certain it is a secret message indicating a crime about to be committed.