Marcus Orlando is an agent with Department Y.
Department Y is a secret division in the British Intelligence community.
-- in progress
-- interesting facts to make note of:
. has an "elaborate flat in Park Lane", made very comfortable through efforts of his devoted butler, Ivan Dolgourki and that man's wife, Nadja.
. has a Harlequen Dane named Bismarck
. Keeps a steel card-index filled with secret information such as addresses, phone numbers, and other pertinent details, all this kept from inquisitive eyes by the use of Old Turkish script, extending so far as to encrypt it all with a code of his own creation.
. exceptionally good at disguises, so much so that he, in costume, was able to fool his beloved pet, a Harlequin Dane named Bismarck. The narrator does remind us, though, that Great Dane's are not known for their intelligence.