Trickster series (Tamora Pierce)

-- New York Times   When Aly is captured by pirates and sold as a slave to an exiled royal family in the faraway Copper Isles, she strikes a bargain with the trickster god. If she can keep young noblewomen Sarai and Dove safe for the summer, then he will return Aly to her family. The task should be simple, but Sarai and Dove are anything but. It’s a time of murderous plotting at court, and Aly will need to rely on her training and the insights...