秘密機関
Like its predecessor, "The Mysterious Affair at Styles", "The Secret Adversary" was first published as an unillustrated serialisation in "The Times" weekly edition (aka "The Weekly Times") as a complete and unabridged text in seventeen instalments from 12 August (Issue 2328) to 2 December 1921 (Issue 2343). Christie was paid £50 for the serialisation rights (£1,545 in 2003 currency).