The Informer
in Harper's Magazine (New York, NY, USA) Vol. 114 (Dec 1906): 
pp.2–170
- Collected as The Informer in A Set of Six (1908)
- Subsequently serialized as De Spion in Suriname: koloniaal nieuws- en advertentieblad (Dutch Guiana, The Netherlands) (Aug 18, 1908 — Sep 8, 1908)
View in Internet Archive BookReader (experimental). 
Illustrated by Wolcott Hitchcock.