Such Bluff as Dreams Are Made Of

Published in Adventure, April 1920 and then in Cassell's Magazine of Fiction, July 1920.. Reprinted in the collection Secret Service Smith.
Smith is on a steamer heading from Bombay to Karachi when a steward falls overboard and dies. Subsequently, it is discovered by the captain that a bag of valuable pearls has been stolen from the officer's cabin. Smith uses an unusual method to discover the thief and murderer.