"The House at Riverton" is a historical novel by Kate Morton that explores the lives of the Montague family and their servants in the early 20th century. The story is narrated by Grace Bradley, a former housemaid, who reflects on her experiences at the grand estate of Riverton and the events leading up to a tragic incident during a summer party in 1924. The narrative shifts between the past and present, revealing secrets and the impact of World War I on the characters. As Grace uncovers the truth, themes of love, loss, and the passage of time are intricately woven throughout the tale.