Secret service under Pitt
Fitzpatrick, William John, 1830-1895
https://archive.org/details/secretserviceund00fitzuoft
https://books.google.com/books?id=w0wpAAAAYAAJ
http://www.forgottenbooks.com/readbook_text/Secret_Service_Under_Pitt_1000398743/1
Review
http://archive.spectator.co.uk/article/14th-may-1892/19/secret-service-under-pitt