In the villages and on the mountains of County Tyrone, in the heartland of the Provisional IRA’s most active Brigade, the golden rule is,  “See nothing, hear nothing, know nothing.” To collaborate with British Intelligence is to court a death sentence.  But word on the mountain is that there’s a tout, an informer. He will be identified, interrogated, tortured, then hooded and shot. Gary Brennard, MI5 field agent, and Parker, who runs the informer, have to protect their man at all costs: he is the critical asset to hold onto until the stakes are high enough – and if the innocent step into the crossfire, that’s just bad luck.