Joe Otterson TV ReporterMatthew McConaughey is attached to star in a series adaptation of the John Grisham novel “A Time for Mercy,” which is currently in development at HBO, Variety has learned from sources.The book, published in 2020, is a followup to Grisham’s books “A Time to Kill” and “Sycamore Row,” all of which center on the character of attorney Jake Brigance. McConaughey previously starred as Brigance in the film adaptation of “A Time to Kill” in 1996.