David's lies unravel around him when Gráinne finds out that he's been sacked from the Teaghlach! Gráinne is furious. She can't understand how he could hide this huge secret from her. Mo has her eye on Tony, but thinks he is not interested. Rather than taking Bobbi Lee's advice, she hangs out with Colm, much to Bobbi Lee's despair! An over-eager and ambitious Gráinne clashes with her mentor Caitríona. The pair are struggling to see eye to eye, but Gráinne's attitude turns their relationship well and truly sour. Has Gráinne ruined her chances with Caitríona?