The Queen Must Die — K.A.S. Quinn

The first entry in a magical, thrilling, time-traveling adventure trilogy

This is the story of Katie Berger-Jones-Burg. One minute, she's under the bed of her New York apartment, and the next she's in Buckingham Palace, at the height of Queen Victoria's reign -- a dangerous place to be. The Royal Family is in mortal peril. In the secret passages of the palace, a plot is afoot. Suspicious figures huddle in the gaslit streets of London. And Katie is not the only time-traveler in the city.