It’s a game of life and death. Ember is a courtesan whose skills as an assassin are well-hidden. On her mission to kill a lord at a party, she manages to poison him but he survives. As punishment, the vengeful lord murders all the women who bear a resemblance to Ember. Her failure in her mission leads to her expulsion from the assassins’ guild. And when a fearsome group of hired killers known as the Sister chase her, Ember is forced to flee the city.