In 1935, ten-year-old Alex Maki, from Bainbridge Island, Washington, exchanges letters with Charlie, a French girl in Paris, building a budding friendship across the Atlantic. Until the Japanese attack on Pearl Harbor and the growing Nazi persecution of Jews force both young people to confront the darkest aspects of human nature. From the desolation of an internment camp on the plains of Manzanar to the horrors of Auschwitz and the devastation of European battlefields, the only thing they can hold onto are the memories of their letters. But nothing can dispel the light between them.