Eye of the law

In 1510 Ireland, a great feast is being held. Into a crowd listening to the story of Balor, the one-eyed god, come two strangers. The younger of the two, Iarla, bears a letter that claims that the wealthy Ardal O'Lochlainn is his true father, which Ardal vociferously denies. So when Iarla is found dead, with one eye missing, some think he was killed by the god--but most suspect Ardal. Mara, the Brehon--or lawgiver--of the Burren, is called to investigate.