Chain of Thorns .The Last Hours Book 3. Cassandra Clare

"Chain of Thorns" by Cassandra Clare, Cordelia Carstairs faces her darkest hour as she grapples with loss, betrayal, and the looming threat of demonic forces in Edwardian London. Having lost her father, her dreams of becoming parabatai with Lucie, and the stability of her marriage to James Herondale, Cordelia is left shattered and vulnerable.

Seeking solace in the vibrant nightlife of Paris alongside Matthew Fairchild, Cordelia's respite is short-lived as news arrives from London: Tatiana Blackthorn has escaped, and the city is under threat from the Prince of Hell, Belial.

Returning to a city engulfed in chaos and suspicion, Cordelia must navigate a web of secrets and deceit while confronting her own conflicted emotions. With the revelation of James and Lucie's connection to Belial, the Herondales become targets of suspicion, further complicating Cordelia's dilemma.

As time runs short and Belial's sinister plan unfolds, Cordelia, Lucie, and their allies must band together to confront the impending threat. But with their bonds strained and their trust shattered, they face the daunting task of standing against Belial's army alone.

In a race against time, Cordelia and her friends must summon their courage, reconcile their differences, and unite against the forces of darkness threatening to consume them all. "Chain of Thorns" is a gripping conclusion to the Last Hours series, exploring themes of sacrifice, redemption, and the enduring power of friendship in the face of adversity.