As Elizabeth I's spymaster, Francis Walsingham was determined to bring about Mary's downfall. In 1586, he found Mary was corresponding with a group of Catholics lead by Anthony Babington. The group were plotting the death of Elizabeth, and Mary's involvement would lead to her execution.

First broadcast:
25 January 2002

Illustrating the difficulties facing Mary Queen of Scots so long as she was in the custody of Elizabeth I in England, and tempted to participate in any plot against the life of Elizabeth I.