Abbreviation: SECO (J. F. Christ, 1947)
Word length: 9,737 (C. E. Lauterbach, 1960)
First published: Strand Magazine, December 1904; Collier's Weekly, January 28, 1905
Haven't we already had most of this story—Obserstein and his spy-vs.-spy colleagues in "The Bruce-Partington Plans," the stolen document in "The Naval Treaty," the blackmail victim in "Charles Augustus Milverton," and so on? Why, then, is this story the best of the lot? Or is it really?