A single harmonica travels through decades and across the world, connecting three young people—in Nazi Germany, Depression-era Pennsylvania, and wartime California—each facing their own struggle for belonging. Pam Muñoz Ryan weaves history, hope, and a touch of magic into a sweeping story about the power of music to carry people through hard times. This title touches on serious historical themes including Nazi persecution and wartime prejudice, and is best suited to older elementary readers.