Mairelon Series by Patricia C. Wrede

Kim doesn't hesitate when a stranger offers her a small fortune to break into the travelling magician's wagon in search of a silver bowl. Kim isn't above a bit of breaking-and-entering. Having grown up a waif in the dirty streets of London-disguised as a boy!-has schooled her in one hard lesson: steal from them before they steal from you.But there is something odd about this magician. He isn't like the other hucksters and swindlers that Kim is used to... moreKim doesn't hesitate when a stranger offers her a small fortune to break into the travelling magician's wagon in search of a silver bowl. Kim isn't above a bit of breaking-and-entering. Having grown up a waif in the dirty streets of London-disguised as a boy!-has schooled her in one hard lesson: steal from them before they steal from you.But there is something odd about this magician. He isn't like the other hucksters and swindlers that Kim is used to. When he catches her in the act, Kim thinks she's done for--until he suggests she become his apprentice. Kim wonders how tough it could be faking a bit of hocus pocus.But Mairelon isn't an act. His magic is real. less

When Mairelon made Kim his ward, he promised to teach her to be a lady and a magician. But magic proves to be harder than it looks for a girl who has just learned to read, and being a lady is even harder. Before frustration - and Merrill's formidably correct aunt - can drive her mad, a mysterious gentleman attempts to burgle the Merrill town house... moreWhen Mairelon made Kim his ward, he promised to teach her to be a lady and a magician. But magic proves to be harder than it looks for a girl who has just learned to read, and being a lady is even harder. Before frustration - and Merrill's formidably correct aunt - can drive her mad, a mysterious gentleman attempts to burgle the Merrill town house. As disaster strikes Mairelon, Kim must negotiate the hazards of London society, aided by a London moneylender, a Russian wizard prince, seven legendary French wizards...and Mairelon's charmingly eccentric mother. less