Dolores accuses Sharon of lying to her in Thursday's Fair City on RTÉ One and the RTÉ Player.
The ructions begin when Dolores asks Sharon: "Are you interviewing for other jobs?"
As Sharon silently puts down her phone, an angry Dolores says: "Were you going to tell me at all?"
"There was no interview," replies Sharon.
"I heard you, Sharon," says Dolores. "Don't lie to me."
Fans can find out what happens next on Thursday 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.
