Boston and New York: Houghton Mifflin, 1928

8vo, pp. 303. Original purple boards, lettered in green to front panel and spine. Illustrated dust jacket. Small area of sunning to foot of spine corresponding to chip in dust jacket. A very good copy in a very good price-clipped dust jacket, a little light chipping and with loss to foot of spine.

First US edition, preceded by the UK edition published earlier the same year.

The fourth of seven Williams titles featuring the German spy Dr. Adolph Grundt, better known as Clubfoot.

HUBIN, p. 439