William Le Queux,
The Closed Book: Concerning the Secret of the Borgias
“ London’s mysteries are many and inscrutable. Surely here was a strange and inexplicable one. Why, indeed, should a mere old book of no value save to a collector be stolen from me in the far-off South and spirited away at express speed across the Continent to that dark, grimy, unlit place? There was some deep, direct motive in it all, of course; but what it was I could not conceive—except that the suspicion was strong upon me that, written within The Closed Book, was some remarkable and highly profitable secret, as indeed the writer himself alleged. ”
