S1, E1: Twelve years into Elizabeth I's reign, the pope declares her a heretic giving England’s Catholics permission to kill her. The Queen looks to her spymaster William Cecil to stop the assassins getting through. Cecil establishes a huge espionage network, England's first secret service. Soon his focus falls on her cousin, Mary, Queen of Scots. Cecil knows Mary must die if Elizabeth is to live.

Starring James Daybell, Robert Hutchinson, Jerry Brotton