The Dark Arts. Lady Midnight

Five years have passed since the events described in the novel "City of Heavenly Fire".
Emma Carstairs has grown up. She has become a Shadowhunter and wants to find those responsible for her parents' deaths. Together with her parabatai Julian Blackthorn, she patrols the streets of mystical Los Angeles, where vampires throw parties on Sunset Strip and fairies are on the brink of open war with Shadowhunters.
Investigating the mysterious murders of humans and fairies, Emma gets closer to unraveling the secret that haunts her.
She has a chance to avenge the death of her loved ones, and Julian has a chance to save his kidnapped brother.
But they have little time – just two weeks. And then the killer will come for them…