Echo by Pam Muñoz Ryan
Lost and alone in a forbidden forest, Otto meets three mysterious sisters and suddenly finds himself entwined in a puzzling quest involving a prophecy, a promise, and a harmonica.
Decades later, Friedrich in Germany, Mike in Pennsylvania, and Ivy in California each, in turn, become interwoven when the very same harmonica lands in their lives.
All the children face daunting challenges: rescuing a father, protecting a brother, holding a family together.
And ultimately, pulled by the invisible thread of destiny, their solo stories converge in an orchestral crescendo.