Lord of Shadows (Dark Artifices Series #2) by Cassandra Clare

A #1 New York Times and Usa Today bestseller Sunny Los Angeles can be a dark place indeed in Cassandra Clare's Lord of Shadows, the bestselling sequel to Lady Midnight. Lord of Shadows is a Shadowhunters novel. Emma Carstairs has just learned that the love she shares with her warrior partner and parabatai, Julian Blackthorn, isn't just forbidden- it could destroy them both. She knows she should run from Julian. But how can she when the Blackthorn family is threatened by enemies on all sides? Their only hope is the Black Volume of the Dead, a spell book of terrible power. Everyone wants it. Only the Blackthorns can find it. Spurred on by a dark bargain with the Seelie Queen, Emma, her best friend, Cristina, and Mark and Julian Blackthorn embark on a journey into the Courts of Faerie, where glittering revels hide bloody danger and no promise can be trusted. As dangers close in, Julian devises a risky new scheme that depends on the cooperation of an unpredictable enemy. But success may come with a price he and Emma cannot even imagine, one that will have repercussions for everyone and everything they hold dear.