Assassin: Lady Grace Mysteries By Patricia Finney

(used, hardcover)
 
Spring 1569. Narrator Lady Grace, 13, youngest lady-in-waiting to Queen Elizabeth I, chooses between three suitors at a glittering ball. But murder descends on the Tudor court. Grace must use her intelligence, stealth, curious nature, and best friends - laundrymaid Ellie, acrobat Masou - to solve the threat to their Queen.