Twelve houses, book 2: The Thirteenth houseSharon Shinn2006

After joining an unlikely band of soldiers and sorcerers to rescue the kidnapped regent Romar Brendan, the shiftling Kirra returns home to learn that her half-sister, Casserah, has been proclaimed heir to the land. But when Casserah refuses to go on a social tour of great Houses, Kirra shifts into her sister's form and makes the rounds-during which she unexpectedly encounters her former compatriots. The motley group of mystics and warriors faces many dangers-and Kirra places herself in peril when she falls in love with the married Lord Romar. Revealing her true identity to him, Kirra begins a tempestuous affair that places them both in mortal danger, and leads them both into the stronghold of the devious lords of the Thirteenth House...