New York: The Dial Press, 1929. First edition. Hardcover. Near Fine / Fine. Original tan cloth, lettered and decorated in black. In a complete and bright example of the dust jacket. A mysterious person blackmails the Prime-Minister of England, demanding ten million pounds in ransom or he will murder the entire population with a newly developed deadly toxin. An exceptional copy of this thriller from the golden age. Very nice dust jacket art by C. C. Snell. Previous owner name to the front free endpaper. Tangentially a biblio-mystery as the PM is a book collector and he later on receives cryptic messages from the evil-doers through slips of paper found inside book purchases. Listed in Otto Penzler's Bibliomysteries.