It was one of the best performing returning drama series of 2014 - Endeavour pulled in millions of viewers and now it returns for its third series. Shaun Evans reprises his role as the young Morse, with Roger Allam playing DI Fred Thursday. Filmed in the beautiful surroundings of Oxfordshire, we'll be treated to four feature length episodes. But what's next for Colin Dexter's characters? Divya Kohli has been finding out.