Anthony Horowitz (Foyle's War, etc) is one of the best tv crime and mystery writers the UK has, and despite this not being one of his better programs, it's still very much worth watching. The problems are in the plotting: it could have been a full hour less and there's too much foreshadowing of the final scenes, which are far too predicable. But still, it's a solid show and while James Purefoy is, as always, terrific, it's Charlie Creed-Miles who steals the show in a highly unsympathetic role.