Chain of thorns by Cassandra Clare

‘Chain of Thorns’ is a Shadowhunters novel. Cordelia Carstairs has lost everything that matters to her. In only a few short weeks, she has seen her father murdered, her plans to become parabatai with her best friend, Lucie, destroyed, and her marriage to James Herondale crumble before her eyes. Even worse, she is now bound to an ancient demon, Lilith, stripping her of her power as a Shadowhunter. After fleeing to Paris with Matthew Fairchild, Cordelia hopes to forget her sorrows in the city’s glittering nightlife. But reality intrudes when shocking news comes from home – Tatiana Blackthorn has escaped the Adamant Citadel, and London is under new threat by the Prince of Hell, Belial. Cordelia returns to a London riven by chaos and dissent.