The Faerie Ring, book 1Kiki Hamilton2011

The year is 1871... Tiki has been making a home for herself and her family of orphans in a deserted hideaway adjoining Charing Cross Station in central London. Their only means of survival is by picking pockets. One December night, Tiki steals a ring, and sets off a chain of events that could lead to all-out war with the Fey. For the ring is a reservoir that holds a truce between the English royals and the world of the Fey. But there are many who want the ring, including the mysterious Rieker, a handsome pickpocket who has been watching Tiki, and a rebel group of UnSeelie fey who would do anything to break the truce...