Richard O'Rawe chats to Ger about his new book, "Stakeknife's Dirty War". It's the inside story of Freddie Scappaticci, one of the British Security Service's most valuable informer inside the Provisional IRA. The book also looks at Stakeknife's involvemement with the IRA's Nutting Squad and the British Spooks who ran the war in Northern Ireland.