Twelve-year-old Kat tries to use her untrained magical powers to prevent use of the wild magic of Sulis Minerva found in Bath, England, where Stepmama has brought the family in hopes of finding Kat's sister a proper match.
In Regency England, when twelve-year-old Kat discovers she has magical powers, she tries to use them to stop her sister from marrying a man she does not love.
