The Haunting of Falcon House by Eugene Yelchin

A long undisturbed bedroom. A startling likeness. A mysterious friend.

When twelve-year-old Prince Lev Lvov goes to live with his aunt at Falcon House, he takes his rightful place as heir to the Lvov family estate. Prince Lev dreams of becoming a hero of Russia like his great ancestors. But he'll discover that dark secrets haunt this house. Prince Lev is the only one who can set them free-will he be the hero his family needs?