Tangle of Thornes

When Eva's brother is murdered, she is forced to investigate the crime herself. What she discovers brings her up against a powerful slave-trading cartel, dark gods, and worst of all her twin sister. In a city of elvish masters and matriarchal dwarves where humans have no rights, the only people on her side are an illegally-freed slave, a senile nanny, and an ex-almost-boyfriend. But even when she nearly loses her job and almost loses her head in a sword fight on the same night, she isn’t deterred. It’s when the nanny goes missing that she really starts to worry.