First published in New York by R.F. Fenno. No date is found anywhere within the first edition, but it is likely circa 1897 since in 1898 Fenno published Mitford's
THE GUN-RUNNER and the title-page for Fenno's
THE KING'S ASSEGAI lists
THE SIGN OF THE SPIDER, which was published in 1896. The Fenno American first edition has the same illustrations as the British first edition.