The Assassin and the Pirate Lord

Celaena Sardothien, feared assassin, has come for retribution. Celaena Sardothien has been sent by the Assassin's Guild to a remote island in a tropical sea in order to collect on a debt owed by the Lord of the Pirates. But when Celaena learns that the agreed payment is not in money, but in slaves, her mission suddenly changes—and she will risk everything to right the wrong she's been sent to bring about.