Kushiel's Mercy is the final novel in Kushiel's Legacy by Jacqueline Carey. It is the sequel to Kushiel's Justice. Kushiel's Justice follows Kushiel's Scion, which makes Kushiel's Mercy the sixth book in the series, or the third book in the series dubbed the Imriel Trilogy.
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.