Evan Evans is settling into his role as Constable of Llanfair, a small town nestled in the mountains of North Wales. Here, he has been a mediator of the minor disputes of the locals, between competing ministers, country merchants, and seemingly every Welch eccentric throughout the region. But an unusual series of events brings unseen hostilities to light, and Evan realizes just how deep the townsfolk's passions and hostilities lie.