In an isolated village in the north west of Ireland, a murder investigation begins when Garda Barry Roche finds a body buried in the bog. In the most personal of cases, Garda Conall Ó Súilleabháin discovers it is his mother, Sabine, who has been missing for 15 years. Conall is forbidden from working on the case, but is drawn into the investigation by a determined young journalist Ciara-Kate, who is using her true-crime podcast to expose the village's deepest secrets. As they unravel the truth, they must confront a community bound by silence and its own moral codes.

《法兰奇国王》讲述了都柏林出租车司机法兰奇的故事，他经营着自己的出租车公司。在得知父亲去世的那天，他不得不开始面对十年前发生的一些事。面对过去，法兰奇最需要做的似乎是和自己和解……导演德莫特·马龙在长片首秀中将焦点对准了那些信守承诺的人，并强调了记忆对于个人的重要性。影片场景与人物着装尽显优雅之风，而布满阴霾的都柏林天气也在提醒着观众人物内心暗藏的思绪。电影媒体《每日银幕》称赞《法兰奇国王》为一部“莎士比亚式的电影”。