If you have access to the BBC iPlayer, have a listen to the excellent Book of the Week, a history of Francis Walsingham. It is cleverly and sharply written,a tremendous story of politics, religion and espionage, and is wonderfully read by Hugh Bonneville.
You can find it here:
BBC iPlayer - Book of the Week: The Queen's Agent: Francis Walsingham at the Court of Elizabeth I: Episode 1
