Laura Dave has released a sequel to “The Last Thing He Told Me.” Fans of the book, which spent 65 weeks on the New York Times Best Sellers list, can also look forward to a second season of the TV adaptation on Apple TV next month. Dave explains that the sequel, “The First Time I Saw Him,” picks up after the events of “The Last Thing He Told Me” and fleshes out details from the past. The new book focuses on themes of forgiveness and second chances. Dave, who co-created the TV series with her husband, is also working on a screenplay for Netflix for her novel “The Night We Lost Him.”