Searching for Shona — Margaret J. Anderson

During the evacuation of children from Edinburgh in the early days of World War II, shy, wealthy Margaret on her way to relatives in Canada trades places and identities with the orphaned Shona bound for the Scottish countryside. In taking Shona's name, Marjorie inherits a battered suitcase containing Shona's only possessions â€" a few shabby clothes and a portrait of a Victorian house that holds a clue to Shona's past.
Marjorie and a little orphan girl named Anna are billeted with two eccentric sisters. As the years pass they form a close family. However, the question of Marjorie real identity troubles her and she must find Shona when the war finally ends.