You work as an assassin in a medieval world

You are an assassin living in a medieval world, but you use your assassinations to help the oppressed. One night, you receive a letter from the Queen of a neighboring kingdom, asking for your help. <br><br>The Queen's husband has become a tyrant, and she begs of you to kill him for her, so that the kingdom may be peaceful once more. <br><br>You agree to her request, but when you arrive at the castle, you learn that the Queen never wrote the letter, and the real writer was a mysterious noblewoman who wants the Queen to be the ruler. <br><br>The real Queen wants you to kill the noblewoman instead.