Title: Peerless Theodosia (Coventry Romances; 30)
First published: March 12, 1980
Description: England hasn't been invaded for several hundred years, until, during the War of 1812, an overzealous English naval officer removes two young siblings from a ship bound for their native America. Fortunately, a British diplomat - the Earl of Claremont - rescues them and sends them to his country home until hostilities have calmed down enough to allow them a peaceful return home. 
This kindly man has no idea of the turmoil he is about to cause his family and friends by this simple, humanitarian act. For Theodosia and Thomas Jefferson Clement are far from the simple youngsters expected by the Earl’s Countess. The young Clements have been on friendly terms with the crowned heads of Europe as well as the highest elected officials in their own country.
The earl's son is betrothed to the daughter of a neighbor, his daughter would rather write books than read them, and his young twins would wear out a regiment of governesses. 
Theodosia makes short work of centuries-old customs, while finding her own surprising true love.