Most of the stories are about smuggling, usually involving a great deal of cleverness; often the plot centers on information that is known to Captain Gault but not provided to the reader.
Captain Gault leads into a plot to smuggle a cargo of rifles directly under the watchful eye of customs.
Captain Gault smuggles pearls using the customs officials themselves, a bribe, and a planted, duplicate bag in a double deception.
Another bait-and-switch plot, this one centering on smuggling cigars directly from Cuba and some play-acting in front of customs officials.
Captain Gault agrees to help a wealthy, older female passenger avoid paying duties on a very valuable necklace.
In another wartime story, Captain Gault plays German soldiers for fools in a standoff situation.