Rating: High Four
Who I'd Recommend to: Fans of Echo, The Mixed-Up Files of Mrs. Basil E. Frankweiler, and anything by Cornelia Funke.
Synopsis (from Amazon):
Ben and Rose secretly wish their lives were different. Ben longs for the father he has never known. Rose dreams of a mysterious actress whose life she chronicles in a scrapbook. When Ben discovers a puzzling clue in his mother's room and Rose reads an enticing headline in the newspaper, both children set out alone on desperate quests to find what they are missing.