Can a killer ever be on the side of justice?In 1983, Professor Robert Balfour was found floating in Airthrey Loch at the heart of Stirling University's campus. His death was deemed a tragic accident but there were other, darker rumours. The death of a politics professor allegedly linked to the armed wing of the Scottish Liberation Brigade was always going to attract conspiracy theories.But that's all they were. Theories. Until now.To mark the 40th anniversary of his father's death, Jonathan Rodriguez has travelled back to Stirling - and he's brought a camera crew with him. Rodriguez is convinced his father's death was no accident - and that at least one of the killers wore a uniform. Desperate to make the problem go away, DCI Malcolm Ford turns to Connor Fraser for help. And then another body is found at nearby Bannockburn.On the trail of a double killer, Connor is forced to confront dark truths about the meaning of justice. And those truths may just break his heart - or stop it, for good.