In Sunday's Fair City, Mairéad discovers a sinister card left at Laura's memorial and is convinced the killer is in attendance.
When Mairéad opens the card, she sees that it reads: "An eye for an eye Sorry Laura."
Fans can find out what happens next on Sunday on RTÉ One and the RTÉ Player at 8:00pm.
Fair City airs on RTÉ One and the RTÉ Player on Sundays, Tuesdays, and Thursdays.
