LETHAL PURSUIT

Novel. London, 1892. Private inquiry agents Cyrus Barker and Thomas Llewelyn receive an unexplained key stamped with the letter Q in the mail. Barker recognizing the key for what it is, proceeds to unlock an anonymous door in the alleyway, which opens to an underground tunnel leading to Downing Street. The Prime Minister has a simple task for Barker and Llewelyn.