The BBC have yet another promising new drama on the cards tonight with a superb cast including Tom Hiddleston, Olivia Colman and Hugh Laurie. Adapted from a John Le Carre's novel, it tells the story of a former soldier working in a Cairo hotel who discovers evidence against international arms dealer Richard Roper, but his attempt to help British intelligence to capture the criminal has disastrous consequences. Five years later, he is based in Switzerland, working at a hotel that he discovers is regularly frequented by Roper. Determined to make amends for his previous failure, he reunites with his contact at British intelligence and they form a plan to infiltrate the arms dealer's inner circle.