After escaping from a terrible life full of abuse, Ismae finds herself at the convent of St. Mortain (Death). There, she learns to use the powers given to her from birth to become an assassin. She trains hard for three years before she's able to put her skills to the test. Her most difficult task comes whens Ismae is called to the high court where there's much political intrigue afoot. Ismae is forced to question everything she's been taught and decide for herself what path her future will take. Can she trust those that she's called to strike down as an assassin truly deserve the vengeance? 
 I found Grave Mercy to be a highly addictive read. It was all the court drama and mystery. Not knowing who's alliance could be trusted and who may be working for the other side of things. 
 Ismae was a very strong character. She was highly underestimated throughout by those who would think a woman incapable of fighting or strategy. I loved when she proved those people wrong, but I also liked that there was still a vulnerability about Ismae. She becomes so unsure of what she's been taught and essentially about herself as well (being the one to mete out the punishments), but she doesn't let that bring her completely down. Instead she learns to trust herself and therefore learns how to move forward with her actions. 
 I loved the scenes between Ismae and Duval. Their interactions were great. They challenged each other. He was certainly one who underestimated Ismae in the beginning, but he quickly brought her into his confidence when he finally understands her capabilities. Ismae, as well, is extremely distrustful of Duval, not only because she doesn't know where is loyalties actually lie but because he makes her feel, which in turn makes her question herself more. But I liked that once they fully made their own choices about the other, they were very much equals in figuring out the traitors among the duchess's court and bringing them to justice. 
 I definitely want to read the other books in the trilogy. I like that Robin LaFevers decided to have a different heroine as the main protagonist for each book, they are all introduced here in Grave Mercy and I look forward to seeing their growth like we saw in Ismae.