From Goodreads:
She is the greatest assassin her world has ever known. But does she have the heart of a killer?

After a year of hard labor in the Salt Mines of Endovier, eighteen-year-old assassin Celaena Sardothien has won the king’s contest to become the new royal assassin. But Calaena is far from loyal to the crown. Keeping up the charade – while pretending to do the king’s bidding – will test her skills in an entirely new way. And it certainly isn’t the only point of confusion for the young girl. Because though she’s made her choice between Dorian and Chaol, the ways of the heart are never simple…

Crown of Midnight by Sarah J. Maas
My rating: 2 of 5 stars

More plot development but it seems all over the place. For a great , the best, assassin she seems too moody and desperate. That said the magic is reasonable but not as well defined and consistent. Will have to wait and see what develops in the next book.