The Robber Baron's Daughter

From the dark of the Bulgarian underworld to the grandeur of central London, what you don't know can't harm you. Or so Nettie believes. Nettie lives a privileged life in a mansion and she is adored by her parents. But her world shatters when her beloved tutor, Miss Kovachev, mysteriously disappears from the Round Tower. Does the ghost in the shadows of Nettie's house have something to do with it? Will spooky Great-Aunt Laetitia help her piece together the fragments? And why won't her parents tell her anything?