The Counterfeit Princess

Iris is only 15 when her parents are suddenly and violently hauled
away from their country estate by her father's enemy, the Duke of
Northumberland. Forced to flee the only home she has ever
known, Iris is hidden by her father's friends and allies, who soon
have the sad task of informing her that her parents are dead.
Despondent, and wanting revenge, Iris agrees to be trained as a
spy by the duke's foes, and then work undercover as a lowly
kitchen maid.
A meeting with the young princess Elizabeth changes Iris's life
completely. Because of their resemblance to each other, Elizabeth
invites Iris to join her court, where she mingles with lords and
ladies and bravely consents to pose as Elizabeth in a desperate
ploy to save the princess's life.
This vivid historical novel from the author of Behind the Mask:
The Life of Queen Elizabeth I plunges readers into the treacherous
world of the English court. An unusual coming-of-age tale featuring
a strong, active heroine, The Counterfeit Princess will appeal
to princess fans everywhere.