There aren’t too many mysteries that emphasize the sea. Key to Lawrence does. And more than 10% of the population has now cruised. Cruise figures are going up. Also I pay extra careful attention to period details, including the language I make use of. The fact that much of this mystery is crafted around a “humidor” is a perfect example as pictured today on http://www.edwardwarethrillers.org. “Humidor” is a nice Edwardian word.