The Copper House - A detective story #978186

This is the story of a great peril, and how it was averted.
It is surprising to think how few persons were aware of this peril, or had any suspicion of the extraordinary events that were taking place in Stockholm during the fateful year 1917.
Nevertheless, at the beginning of the year, a little weekly newspaper published a very striking open letter, entitled: "Who is the Man in the Whirlpool?"