Hayley's anger boils over in Sunday's Fair City on RTÉ One and the RTÉ Player.
She spots Mondo and Holly celebrating a business win with a bottle of Prosecco, misreading it as them toasting the trial date.
Mondo will soon stand trial over the death of Hayley's father, Anto.
In The Station, Hayley asks James and Sharon: "What, is he happy about the trial date? Does he think he's going to get off or something?"
"No, I'm not standing for this," says Hayley as she moves to confront Mondo.
"What the hell have you got to celebrate?" she asks him.
Fans can watch what happens next on Sunday on RTÉ One and the RTÉ Player at 8:30pm.
Fair City airs on RTÉ One and the RTÉ Player on Sundays, Tuesdays, Thursdays, and Fridays.
