Helen Castor looks at what happened when England was faced not just with inadequate kings, but no kings at all. In 1553, for the first time in English history all the contenders for the crown were female. In the lives of these three Tudor queens - Jane, Mary and Elizabeth - she explores how each woman struggled in turn with wearing a crown that was made for a male head. Elizabeth I seemed to show that not only could a woman rule, but could do so gloriously.