Chain of Thorns (The Last Hours, Book 3) by Cassandra Clare

In the riveting conclusion to Cassandra Clare's Last Hours series, "Chain of Thorns," Cordelia Carstairs faces devastating losses. Her father murdered, parabatai plans shattered, and her marriage to James Herondale in ruins, Cordelia is now bound to the ancient demon Lilith, robbing her of Shadowhunter power.

Escaping to Paris with Matthew Fairchild, Cordelia seeks solace, but news of Tatiana Blackthorn's escape and a new threat from the Prince of Hell, Belial, shatters her respite. Returning to a chaotic London, Cordelia discovers Belial's familial ties to James and Lucie, casting suspicion on the Herondales.

As chaos unfolds, Cordelia grapples with conflicting emotions for James and the potential for a new life with Matthew. Amidst friends torn by secrets, they face Belial's impending onslaught alone. Time dwindles, and Cordelia, Lucie, and the Merry Thieves must confront Belial's deadly army in shadowy London. To save their city and families, they must unite, trusting each other and facing their deepest fears. Failure risks not only their worldly possessions but their very souls.

"Chain of Thorns" promises a gripping tale of courage, sacrifice, and the enduring bonds that hold the Shadowhunters of London together as they stand against the impending darkness threatening to consume everything they hold dear.