Gráinne, fired up by Peaitsí's rhetoric, makes one last play for David and plans to cut her losses and leave Ros na Rún if things don't go her way. Vince, hurt and angry with Caitríona, is drawn to Bobbi Lee and helps her get her singing voice back. Tension escalates between Mack and Dee when they have yet another disagreement, this time about Dee's baby plans much to a Mack's horror... Will Dee find out about Mack and Katy before their big day?