<human>:  What books have been popular this summer?
<bot>: Some of the most popular books this summer have been Normal People by Sally Rooney, Where the Crawdads Sing by Delia Owens, The Family Upstairs by Lisa Jewell, The Silent Patient by Alex Michaelides, Diary of a Wimpy Kid: The Meltdown by Jeff Kinney, and Unsheltered by Barbara Kingsolver.