The film centres on local small-town GAA football "outside the bright lights of Croke Park", following a player who struggles to get back into the sport after an injury.
When a man, new to Ireland, experiences homelessness and needs a place to sleep, he secretly takes up residence in the home of an elderly blind woman, which leads to them forming a unique bond.
Eilis is addicted to mustard. When she falls madly in love, she's sure her demons are finally banished, but when the relationship breaks down her shameful addiction to the yellow stuff returns with a vengeance.