'All is secrecy. All is lies... Does anyone tell us the truth here?' Scotland, 1691. Hooded figures have been seen in the woods and the dead have been wrenched from their resting place under the cover of darkness and their graves desecrated. A body is found floating in the River Clyde and a Duchess is determined to find answers. John MacKenzie's latest case takes him and his loyal assistant Davie Scougall to Hamilton Palace to discover the truth behind the curious drowning of local woman Bethia Porterfield. The kirk and sheriff have pronounced a verdict of self-murder, but the Duchess is unconvinced, and every soul connected to the case is guarding secrets of their own. Despite mounting pressure to leave the West, MacKenzie and Scougall must navigate the murky waters of the Clyde, where nothing is as it seems, to uncover the truth – was Bethia's death an accident, a suicide, or part of something much more sinister?