Tadhg is in for a shock when he learns that Maggie, his first love has arrived back to Ros na Rún! How will he feel about this blast from the past? Fia's revenge plan is in motion and Adam is none the wiser when she asks him to meet up. He has no idea who she's invited to hear his big news, which ends up hurting Adam more than ever... Will Fia regret getting her own back on Adam? Gráinne tries her best to sabotage Tony's relationship with Mo in a bid to get her to notice Colm, and O'Shea is convinced that Micheál and Laoise are secretly dating.