Cloak of Darkness by Sara E Tonissen

Blessed by the Maker.
Cursed by the Destroyer.
Every life is shrouded in darkness.
The continent of Cathal has been threatened by war for eight grueling years, and the seven kingdoms are each determined to rise victorious. For Queen Snow White, maintaining order in her kingdom is difficult enough, but when the infamous assassin, Red Riding Hood, begins to terrorize her citizens, Snow White must quickly eliminate the threat to her rule.
Red is one of the most skilled assassins that Cathal has ever seen, and she will not let wartime politics get in the way of her work. She smiles at the fear that she ignites in her wake of destruction. If only the people of Cathal knew that their most hated killer was nothing more than a haughty teenage girl struggling to control the dark magic flowing through her veins.

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