October 1914: the destroyer Svea emerges from the Stockholm archipelago bearing south-south-east. On board is Lars Tobiasson-Svartman, a naval engineer charged with making depth soundings to find a navigable channel for the Swedish navy. The...
The following story was told to the writer by Nick Carter as being the most remarkable, and in many respects, the most mysterious case in his experience. It baffled the shrewdest detectives on the regular force, and had practically been abandoned...