Violent events at a supposedly ‘safe-house' where a lone gunman has infiltrated, leaves one police officer dead as he attempts to kill a protected witness. He then blasts DI Gillian Cramer but can Dr Jonathan Paige save her? Dr Paige and DI Cramer are called out to assist Pc Lyle when a small-time crook-turned-super grass whom the police have been guarding causes a commotion.