The Cold War Heats Up When a KGB Defector Exposes Operation Glass, a Potentially Devastating Soviet Plot to Activate Sleeper Agents Across the UK. How to Stop It? the Charismatic But Paranoid Head of Mi-5, Known Simply As 'Daddy' - Assembles a Secret Committee of Spies and Intelligence Officers to Investigate. They're the Only Colleagues He Trusts in a World of Double Agents and Lies, But Has He Chosen Well? Brian Cox (Troy, the Bourne Supremacy) and Tom Hughes (Dancing on the Edge, the Lady Vanishes) Lead the All-Star Cast of This Stylish Spy Thriller, Guaranteed to Keeps You in Suspense.