The Dark Wing — June Wetherell

When Gelia's family perished in the Great Chicago Fire, she found she'd lived a lie for seventeen years. She was not Gelia Harrison, but the daughter of a total stranger. But her father, Brian O'Neill, had acquired another family: a wealthy wife, an unreliable brother-in-law, and a daughter near Gelia's age. If she was to live with the O'Neills, Gelia would have to live another lie. But in that house of strangers, her secret was just one of many. . .