Unexplained Mysterious Disappearances

In Unexplained: Mysterious Disappearances, readers in grades 5-9 will explore people and places throughout history that have been involved with sudden, mysterious disappearances. What happened to Amelia Earhart? Why is the Bermuda Triangle so mysterious? In some cases, theories can explain what happened. In others, no one is sure. The Unexplained series is designed for readers to be able to fli...