Chain of Iron .The Last Hours Book 2. Cassandra Clare

"Chain of Iron" by Cassandra Clare, Cordelia Carstairs finds herself trapped in a web of deception and danger in Edwardian London. Despite appearing to have everything she desires, including an engagement to James Herondale and possession of the legendary sword Cortana, Cordelia's life is far from idyllic.

Her engagement to James is a facade, arranged to salvage her reputation while James remains in love with another. Additionally, Cortana inflicts pain upon Cordelia when she touches it, adding to her burdens. To make matters worse, a mysterious serial killer is targeting Shadowhunters in London, leaving behind no clues.

Cordelia, James, and their friend Lucie must navigate the treacherous streets of London to track down the killer. However, each of them harbors secrets that could unravel everything. Lucie is experimenting with raising the dead, Cordelia has sworn allegiance to a mysterious power, and James fears he may be the very killer they are hunting.

As they delve deeper into the investigation, they uncover shocking truths about themselves and the world around them. "Chain of Iron" is a gripping tale of love, betrayal, and mystery, where the Shadowhunters must confront their inner demons while battling external threats to protect their city and each other.