Francis Hodgson Burnett 
Lost Prince [PDF ebook] 

Twelve-year-old Marco has lived his entire life in a series of dingy, barely habitable rented flats, moving around Europe at a moment’s notice, and seeing his father only sporadically. Remarkably, along the way, Marco has attained a formidable intelligence, and his kind heart and even disposition shine through in everything he does. One day, secrets from his past begin to surface, and suddenly the mystery of his true identity begins to fall into place.