Order This Book OnlineFans of Anne of Green Gables will identify with 11-year-old Calpurnia in The Evolution of Calpurnia Tate. A budding young naturalist growing up at the turn of the 20th century, she is fascinated by Charles Darwin, and is encouraged by some and quashed by others. The question of who will win out grips the reader’s attention to the last page, with plenty of humor and period detail thrown in.