Drums of Autumn" is the fourth book in Diana Galbadon's "Outlander" series, where time-traveling 20th century nurse Claire Randall reunites with her 18th century Scottish Highlander husband, Jamie Fraser, in the American frontier, facing new challenges and dangers while navigating the complexities of their family dynamic, particularly with the arrival of their daughter Brianna who travels back in time to find them; the novel is filled with historical details, romance, adventure, and a touch of fantasy.