Ronald H. Balson, the author of bestsellers “Once We Were Brothers,” “Saving Sophie” and “Karolina’s Twins,” is a Chicago trial and appellate lawyer with the Chicago law firm of Stone Pogrund & Korey LLC.His latest book, “The Girl from Berlin” (St. Martin’s Press), is a work of fiction starting in the present but based on historical facts and circumstances going back to the rise of National Socialism in the 1930s.It tells of the fight for survival against the …