Lois McMaster Bujold

A six-year-old shiplost girl draws the kin Jurald family of Vilnoc into complex dilemmas, and sorcerer Learned Penric and his Temple demon Desdemona into conflict—with each other. It will take all of Penric's wits, his wife Nikys's wisdom, and the hand of the fifth god's strangest saint to untangle the threads of their future.