In 1983 Professor Robert Balfour was found floating in Airthrey Loch his death deemed a tragic accident But there were darker rumours. The death of a politics professor allegedly linked to the armed wing of the Scottish Liberation Army 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 - with a camera crew. Rodriguez is convinced his father’s death was no accident - and that 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 nearby. On the trail of a double killer Connor must confront dark truths about the meaning of justice. And those truths may just break his heart - or stop it for good.