"A Costume Piece" is a short story by E. W. Hornung, and features the gentleman thief A. J. Raffles, and his companion and biographer, Bunny Manders.

[1] The story was also included in the collection The Amateur Cracksman, published by Methuen & Co. Ltd in London, and Charles Scribner's Sons in New York, both in 1899.

[2] Raffles visits Bunny's flat at midnight to tell him about a banquet at the Old Bohemian Club he attended earlier.

The banquet was given for Reuben Rosenthall, an enormous, brutish, alcoholic millionaire who has returned to England from South Africa after making his money in diamond fields.

Raffles brings Bunny via omnibus to an artist's studio, on the King's Road in Chelsea.

Off-handedly, Raffles also mentions that Rosenthall was an Illicit Diamond Buyer, or I. D. B., who could go to prison if found out.

When they see the inhabitants, Raffles and Bunny climb a wall, cross Rosenthall's lawn, and enter through an unlocked window.

No sooner had the burly pugilist obstructed his fire than Raffles was through the window at a bound; while I, for standing still and saying nothing, was scientifically felled to the floor.

Ruthlessly, Rosenthall shoves Bunny against a door, and shoots around his head, shocking the ladies present.

[4] The drama features Jeremy Clyde as Raffles and Michael Cochrane as Bunny.

The episode closely follows the plot of the original story, with some minor changes: "A Costume Piece" was adapted as the second episode of Raffles, the Gentleman Thief, a series on the American radio show Imagination Theatre.