Portrait of a Lady : A Leonardo DaVinci Mystery

In the wake of the deaths of two female servants, Leonardo da Vinci, court engineer to the Duke of Milan, asks his apprentice, Dino, to go undercover disguised as a woman in the service of Contessa Caterina, unaware that "Dino" is in reality a young woman masquerading as a boy in order to serve as the master's apprentice. Original.