The Art of Keeping Cool by Janet Taylor Lisle

about the book

Fear permeates the Rhode Island coastal town where Robert, his mother, and sister are living out the war with his paternal grandparents: Fear of Nazi submarines offshore. Fear of Abel Hoffman, a German artist living reclusively outside of town. And for Robert, a more personal fear, of his hot-tempered, controlling grandfather.
As Robert watches the townspeople's hostility toward Hoffman build, he worries about his sensitive cousin Elliot's friendship with the artist. And he wonders more and more about the family secret everyone seems to be keeping from him—a secret involving Robert's father, a bomber pilot in Europe. Will Elliot's ability to detach himself from the turmoil around him be enough to sustain him when prejudice and suspicions erupt into violence? And can Robert find his own way to deal with the shocking truth about his family's past.