On Tuesday night's Fair City, Carol's suspicions mount as she walks in on Robbie and Karen in a compromising position.

When Robbie is unable to babysit for Carol, Karen offers her services, but ends up leaving Jack with Kevin.

When Carol realises that Karen has left Jack to go to her house, Carol goes home only to walk in on Robbie and Karen in an unfortunate situation.

Will Carol believe Robbie?

Watch this sneak peak to find out what happened with Robbie and Karen: