In 1967 Ireland, two elderly women, Lily and Eileen, along with a younger woman, Dolly, form a musical band called the Miracles as part of a talent show organised by the Catholic Church and win tickets to go on a pilgrimage to Lourdes for various reasons.

Lily wants to go to Lourdes as part of a life-long dream, Eileen hopes that a pilgrimage would cure a lump in her breast, while Dolly believes that it would make her mute son Daniel speak.

At the last minute, they are joined by Chrissie, the estranged daughter of their recently-deceased friend Maureen and a cousin of Eileen, who has returned from Boston after 40 years to attend her mother's funeral.

Chrissie is initially reluctant to join the pilgrimage as her pregnancy with Lily's now-deceased son Declan had been openly revealed by Eileen, resulting in her being banished by her community.

At the site's baths, Eileen loses her faith after being told by staff that there are fewer miracles that have happened than what she expected, while Daniel remains mute despite coming into contact with the water and hides in the grotto, where he is comforted by Chrissie.

That evening, a drunk Eileen lashes out in the hotel at Chrissie for her past and accuses her of flirting with Father Dermot, whom she also calls a charlatan due to her religious disenchantment.

[9] Sony Pictures Classics acquired the rights to the film in the United States, Latin America and select territories in Southeast Asia and Eastern Europe.