Dragonfly in Amber, the second book in the best-selling Outlander series, is written by Diana Gabaldon. 
 
Her books are difficult to classify by genre, since they contain elements of romantic fiction, historical fiction, and science fiction. The stories center around a time-travelling 20th-century nurse (Claire Randall) and her 18th-century Scottish husband (Jamie Fraser), and are located in Scotland, France, the West Indies, and America.