Things are going well between Sonny and Crystal, until Ian accuses Sonny of having an affair. Things are worse than ever between Colm and Mo but when Colm finds himself in a dilemma, Mo agrees to look after Harry for him.

Someone from Mo's past comes to town and Mo has no choice but to come clean to Colm. What other secrets could she be keeping? On hearing Penny's podcast Vince thinks it is a little too close to home and warns Caitríona.