Sinead and Brigid mourn the loss of their older brother Ian, whose death leaves them alone to contend with their distant mother and alcoholic, abusive father.

Ian tortured his sisters with pranks when he was alive. Now, Sinead feels she must continue what she deems the tradition of the oldest by pulling a cruel prank on the youngest sibling, Brigid.

But as Sinead scoops lasagna into Brigid's bed, she sees Ian's face staring back at her in the mirror. When Brigid retaliates by pouring hot sauce into Sinead's juice, Ian materializes in the kitchen. The girls form a brief truce to aid their brother's ghost, who they assume needs help or has some sort of "unfinished business."

Sinead breaks the truce to put gum in Brigid's hair, and Ian reappears, this time trying to speak to her. She cannot hear him, and he disappears in a fury, retreating to the kitchen to smear lasagna all over the walls and floor.

The next sighting occurs when Brigid pours Nair into Sinead's shampoo. Ian appears in the mirror and grows increasingly irritated by Brigid's line of questioning, until he snatches the Nair and pours it over her head.

Ian's ghost stages its final appearance at a tense family dinner, during which the father cruelly forces the sisters to drink the hot-sauce-orange-juice concoction. When they finally unite together and disobey him, he shouts that the disrespect in the household ought to have ended with Ian's death — at which point, Ian's ghost violently smashes all the dishes.