The 2009 feature, starring Colin Farrell and Alicja Bachleda, written and directed by Neil Jordan, mixes themes from irish mythology into contemporary settings.
Syracuse, played by Farrell, is a fisherman living alone but tends to his ten year old daughter, Annie who has failing kidneys. One day, a nearly-drowned woman gets caught in Syracuse's net whilst on a fishing expedition; she speaks oddly sand calls herself Ondine. An Ondine, according to theory, is a water spirit who has a beautiful voice and according to some legends, cannot get a soul unless they marry a man and bear him a child. This led Ondines to be a motif in romantic and tragic literature.
In the film, Annie believes his father's story about the 'Selkie', is true and discovers this when she finds Ondine in his isolated cottage. This fairy-tale story makes the audience question whether there is a happily ever after, or do the realities of alcohol, illness and bad luck say otherwise.
....As the priest reiterates in the film, misery's easy, it's happiness you have to work at.
Methodical; performed, disposed, or acting in a systematic way; systematic; orderly: a methodical person.