Newt's Emerald is a sparkling gem of a book, a Regency romance with an added dash of fantasy. The main character is Lady Truthful Newtington, whose magical inheritance- the Emerald- is stolen on her eighteenth birthday. She travels to London to stay with her great-aunt, a feisty sorceress, who comes up with a plot. Since Truthful cannot possibly search for the Emerald on her own, she will dress as a man to search London for clues to the lost jewel. Naturally, while in disguise, she runs into a handsome and intelligent man who offers to help her search- though he has some secrets of his own. This book reminded me very favorably of A Brief History of Montmaray and also of Sorcery and Celia, two other fantasy historical fiction books that I greatly enjoyed.