Into Thin Air: A Bobbie Farnsworth Mystery

While spending summer vacation in a small North Carolina town, 14-year-old Bobbie Farnsworth becomes fast friends with a young girl named Sam. As their friendship grows, Bobbie learns Sam's twin sister, Serena, disappeared without a trace three years prior. Although the authorities believe Serena was kidnapped, Sam is convinced something else happened to her sister; she just doesn't know what.

As the end of their vacation grows near, Bobbie browses through pictures she's taken during their...