'Just after dawn, the assassin arrived to begin his day’s work.  He noticed that Secretary Thurloe's door was ajar and peering in, smiled when he saw that his master had fallen asleep, the quill still resting in his hand. A cursory glance at the papers spread across the desk told him that the puzzle remained unsolved.
“When you have searched and found nothing,” he whispered to himself, “ then you will need to call on my unique skills!"

After all, there was more to spyery than paper'