Tonight's Panorama investigates the phone-hacking scandal that has gripped the UK over the past fortnight. As Rupert Murdoch's grip on his media empire begins to weaken, this programme investigates just how far the media mogul's influence extends and whether it goes as far as Downing Street and beyond. For decades, Rupert Murdoch has held somewhat of a unique and powerful position in Britain through his media empire. After the revelations of the News of the World phone hacking scandal, Panorama tells the inside story of how the media giant's influence was dramatically challenged. This will prove to be especially interesting considering that Murdoch will be grilled by a special government committee on live television at lunch time on Tuesday.