Robber baron's daughter
by Jamila Gavin

Twelve-year-old Nettie's sheltered and privileged life changes after her beloved tutor mysteriously disappears and Nettie, aided by the son of a household employee, begins to learn the truth about her father, whose wealth began with trafficking in illegal aliens.
Organized crimeEspionage in fictionSpies in fictionWealthWealth in fictionHousehold employeesFamily lifeFictionIllegal aliensFamily life in fictionEngland in fictionSpy stories