Dunja Dopsaj/MASTERPIECE Miss Scarlet and The Duke is dropping “The Duke” — literally — as actor Stuart Martin exits the hit series ahead of season 5. PBS Masterpiece announced on Thursday, February 29, that private detective Miss Eliza Scarlet (Kate Phillips) will be back for a new season — but her favorite Scotland Yard detective William “The Duke” Wellington (Martin) won’t be by her side. Instead, the show is being renamed Miss Scarlet for season 5. “It has been such an incredible joy to brin