BESTSELLERAn explosive exposé of how British military intelligence really works, from the inside. The stories of two undercover agents -- Brian Nelson, who worked for the Force Research Unit (FRU), aiding loyalist terrorists and murderers in their bloody work; and the man known as Stakeknife, deputy head of the IRA's infamous ‘Nutting Squad', the internal security force which tortured and killed suspected informers.