Bloody Jack: Being an Account of the Curious Adventures of Mary "Jacky" Faber, Ship's Boy by L.A. Meyer

Orphaned by the London plague of 1797, Mary Faber survives by joining a street gang. When her best mate is killed, she cuts her hair, changes her name, lies about her age, and secures a post as a ship's boy on the HMS Dolphin. Thus, the "Bloody Jack" series begins... with its impulsive heroine continually surrounded by challenges that cannot quench her love for adventure.

Theodosia and the Serpents of Chaos by R. L. LaFevers

Theodosia Throckmorton is an 11-year-old girl living in London in 1906. She sleeps in a sarcophagus, and can read hieroglyphics. In short, she's not your average girl. Theo's parents run London's Museum of Legends and Antiquities, the place where she spends most of her time. What her parents don't realize is that many of the antiquities that Theo's mother brings home from her archaeological expeditions are cursed. It's up to Theo to remove the curses, unraveling international intrigue along the way.

The Case of the Missing Marquess by Nancy Springer

After the disappearance of her mother, 14-year-old Enola Holmes is determined not to allow her older brothers, Mycroft and Sherlock, to send her off to boarding school. Raised by an unconventional mother who largely ignored Victorian values, Enola has grown accustomed to freedom. She runs away to London in the hopes of reuniting with her mother - but finds instead a series of mysteries to solve.