There are 3 books in the Trade Pact Universe series. The newest book is To Trade the Stars which came out in 2002.

1
A Thousand Words for Stranger

Book cover of A Thousand Words for Stranger
The tenth anniversary edition of Julie Czerneda's debut science fiction novel, the story of a woman on the run, from the law, her own people, and an unknown pursuer. Her memory taken from her by a stasis block, Sira must stay free long enough to regain her identity and the…
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2
Ties of Power

Book cover of Ties of Power
Sira, the most powerful member of the alien Clan, has dared to challenge the will of her people--by allying herself with a human. But can she hope to carve a new life for herself when the Clan is determined to reclaim her genetic heritage...at any cost?

3
To Trade the Stars

Book cover of To Trade the Stars
Julie E. Czerneda's 1997 debut, A Thousand Words for Stranger, was the first novel of the Trade Pact Universe-an instant best-seller, Science Fiction Book Club Editor's Choice and Locus Recommended First Novel. Book two, Ties of Power, further established the author's reputation as a master of vivid alien worlds-and had…