Kushiel's Mercy

Kushiel's Mercy is a fantasy novel by American writer Jacqueline Carey, the sixth book in her Kushiel's Legacy series. First published in 2008, it is the sequel to Kushiel's Justice, and the final book in the Imriel Trilogy, the second trilogy in the Kushiel's Legacy series.

Plot summary
Sidonie and Imriel confess their love, causing a national uproar. To mitigate the turmoil and quell the uprising, Queen Ysandre decrees that she won't acknowledge the lovers. To appease the Queen, Imriel embarks on a quest to find his mother and return her to the kingdom where she faces treason charges and execution.