The Man with the Clubfoot is a 1918 spy thriller novel by the author Valentine Williams.Reilly p.1495 It is the first in his series of novels featuring the character of "Clubfoot", Germany's top secret agent Doctor Adolph Grunt. He is pitched against Desmond Okewood, a young officer employed by British intelligence.Burton p.430 It was followed by several sequels.
References
Bibliography Burton, Alan. Historical Dictionary of British Spy Fiction. Rowman & Littlefield, 2016. Reilly, John M. Twentieth Century Crime & Mystery Writers. Springer, 2015.