There are 2 books in the Trickster's Duet series. The newest book is Trickster's Queen which came out in 2004.

1
Trickster's Choice

Book cover of Trickster's Choice
When you gamble with kingdoms, all bets are off. Legends are born in this thrilling andĀ New York TimesĀ bestselling spy saga from the fantasy author who is legend herself: Tamora Pierce.

Aly is from a family known for great deeds. She is the daughter of Alanna, the famed knightā€¦
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2
Trickster's Queen

Book cover of Trickster's Queen
NO LONGER A slave, Alianne is now spying as part of an underground rebellion against the colonial rulers of the Copper Isles. The people in the rebellion believe that a prophecy in which a new queen will rise up to take the throne is about to be realized. Aly isā€¦