In this exclusive sneak peek of the next episode from Carrigstown, Carol threatens to expose Cathal to Aidan.
Coming up in Wednesday's Fair City, Carol squares up to Cathal at the pub and tells him she knows he was acting as a police informant.
"The term I'd personally prefer is 'grass'," she tells him. "I know all about your sideline job with the guards. You should have a word with Aidan there, see what he thinks."
Carol calls Aidan over and says she has some information he might be interested in when Yates walks in and realises what's going on in the nick of time.
"What do you think you're doing?" Yates asks Carol furiously.
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Find out what happens next on RTÉ One on Wednesday night at 8pm.
Fair City is on RTÉ One on Sundays and Tuesdays to Thursdays.
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