Books in the Sisters in Blood series

Having survived the attack inside the Natick Mall, Brooke dreads the thought of spending decades in exile while she waits for the media firestorm from the superhuman brawl to run its course. But soon after fleeing Boston, she discovers the battle caught the eye of forces far more lethal than humans. Captured by the dark Goddess Lilith, Brooke has her soul stripped away, becoming a greater demon tasked with leading Hell's forces to war. But not even Lilith could have anticipated the powerful bond Brooke has formed with her family. Or the unlikely alliances they'd forge in an attempt to save her. Her love for Sienna and her sisters prevents her from fully embracing the darkness, but the demon spirit inside her is claiming more control of her mind with each passing day. It's a race against time, and the whole world is at stake.