Kat, Incorrigible — Stephanie Burgis

Katherine Ann Stephenson has just discovered that she's inherited her mother's magical talents, and despite Stepmama's stern objections, she's determined to learn how to use them. But with her eldest sister Elissa's intended fiance, the sinister Sir Neville, showing a dangerous interest in Kat's magical potential; her other sister, Angeline, wreaking romantic havoc with her own witchcraft; and a highwayman lurking in the forest, even Kat's reckless heroism will be tested to the upmost. If she can learn to control her new powers, will Kat be able to rescue her family and win her sisters their true love?