1535 A Time Travel Novel

Jay, Ned and Kat are three children who find themselves in the topsy-turvy world of 1535, where they have to work to survive at Greenwich Palace, the residence of Henry VIII. They have to find their way home without inciting suspicion, but danger lies ahead with the toppling of Henry VIII's second wife, Anne Boleyn. Can they escape back to their own time before they run into real trouble?