Grace Gummer ( The Newsroom ) has joined Dakota Fanning ( All Her Fault ) in an untitled thriller series created by Alex Cary. Here are the details. Mystery project adds Grace Gummer As reported by Deadline , Grace Gummer, who’s the daughter of Meryl Streep ( The Post ) has joined an upcoming untitled Apple TV thriller series, where she’ll star alongside Dakota Fanning. The show’s confirmed cast so far also includes Stellan Skarsgård ( Dune ), and Daryl McCormack ( Twisters ). Interestingly, Fanning will co-produce the series alongside her sister, Elle Fanning, who recently starred in the first season of Margo’s Got Money Troubles , also on Apple TV. Other co-producers include Brittany Kahan Ward ( The Great ), Julie Gardner ( Lady In The Lake ), and Kari Skogland ( Smoke ), who will also direct.…