The Affair of the Pink Pearl is a short story written by Agatha Christie which was first published in The Sketch in October 1924. 
Did the wealthy kleptomaniacs strike again? Her friends ask Tuppence and Tommy Bereford of Blunt's Brilliant Detectives to find out. They have 24 hours to locate the fabulous pink pearl in 'The Affair of the Pink Pearl'. In 'Finessing the King', a coded newspaper message draws Tuppence and Tommy to a costume ball, a bohemian restaurant, and murder.