Grace Macallan is finding a career away from the frontline difficult, so when she’s asked to review a suicide at Barlinnie Prison it feels like a break. The dead prisoner is Tommy McMartin, once heir to one of Scotland’s criminal families, but when he was convicted for the murder of his gay lover, the family disowned him. As Grace unearths the truth of what befell McMartin, she is faced with her greatest dilemma yet: to expose the truth or let the dead lie still.