This is the fifth in a series of nine episodes regarding England's greatest monarch, Elizabeth I. Having survived the rule of Bloody Mary, life ought to have gotten easier for the newly raised Queen Elizabeth, but her vow to remain unwed placed her rule in a precarious position. For those who wanted to remove England's protestant ruler, there was no more attractive option than the Queen's cousin, Mary Queen of Scots. This episode traces their 19 year long feud, including the 'war of the rough wooing,' the 'Bothwell Conspiracy,' and the 'Casket letters.'