On the Pembrokeshire border, a man (Michael Smiley) working solo shifts in the quietest toll booth in Wales, hides from a criminal past where nobody would ever look. As his past actions catch up with him and his peace is shattered, he enlists the help of local ne'er-do-wells and oddballs (including a female Elvis impersonator, rampaging triplets and disgruntled sheep farmers) when village police officer Catrin (Annes Elwy) grows increasingly suspicious.