The Invisible String (The Invisible String, 1)With over 1. 5 million copies sold, this accessible, bestselling picture book phenomenon about the unbreakable connections between loved ones has healed generations of children and adults alike. A Spanish edition (El hilo invisible by Patrice Karst and Joanne Lew Vriethoff) and a companion workbook are also available (The Invisible String Workbook). Parents, educators, therapists, and social workers alike have declared The Invisible String the perfect