The crime was simple enough. The new experimental long-range cannon, developed and cast in France, was shipped topside because of ease of loading and removal. Sometime last night, when it was high tide, some person or persons had taken it. A cannon of this length and weight should require several dockworkers using block and tackle to remove it. Block and tackle, being notorious for making noise, and the light needed for the delicate operation, would make secrecy seemingly impossible.