A Study in Darkness — Emma Jane Holloway

When a bomb goes off at 221B Baker Street, Evelina Cooper is thrown into her uncle Sherlock's world of mystery and murder. But just when she thought it was safe to return to the ballroom, old, new, and even dead enemies are clamoring for a place on her dance card.

Before Evelina's even unpacked her gowns for a country house party, an indiscretion puts her in the power of the ruthless Gold King, who recruits her as his spy. He knows her disreputable past and exiles her to the rank alleyways of Whitechapel with orders to unmask his foe.

As danger mounts, Evelina struggles between hiding her illegal magic and succumbing to the darker aspects of her power. One path keeps her secure; the other keeps her alive. For rebellion is brewing, a sorcerer wants her soul, and no one can protect her in the hunting grounds of Jack the Ripper.