Detective Martin Murphy has been given one last chance. After a terrible experience working undercover in Northern Ireland, he's in London, and about to fail another psychological assessment. While his life spirals out of control, his boss sends him back undercover to expose a gang of diamond thieves who have just burnt a security guard alive. As he gets closer to the gang's leader, Murphy realises their plans are more ambitious - and more deadly - than anyone expected...

Detective Martin Murphy has been given one last chance. After a terrible experience working undercover in Northern Ireland, he's in London, and about to fail another psychological assessment. While his life spirals out of control, his boss sends him back undercover to expose a gang of diamond thieves who have just burnt a security guard alive. As he gets closer to the gang's leader, Murphy realises their plans are more ambitious - and more deadly - than anyone expected...