Echo is a book with several parts. The beginning and ending revolve around Otto, a boy who gets lost in a forbidden forest, who meets three mysterious sisters. He becomes entwined with a prophecy, a promise, and a harmonica.
Several years later, Friedrich who lives in Germany during Hitler’s reign finds a special harmonica that does not sound like anything he has ever heard. Friedrich must rescue his father from a work camp when he talks out against Hitler. The harmonica finds its way to Pennsylvania and into the hands of Mike. Mike and his brother are being adopted, but the woman who is adopting them does not want boys, especially two. When Mike learns of a harmonica group of kids that travels the country, he decides to try out in order to protect his brother. He makes a deal with their new mother, if he makes the traveling harmonica group, she will let his brother stay with her. The harmonica then finds its way to Ivy in California. Ivy’s brother has enlisted in the Army when the Japanese bombs Pearl Harbor. It becomes Ivy’s job to keep their family together.
The lives of Friedrich, Mike, and Ivy converge in a way that would someone would deem as fate.