The family plan a party to celebrate Gerry’s 13th birthday, but when a plague of mosquitoes descends, they are forced to hold it inside. As the party planning progresses, Louisa is finding it hard to accept that her youngest is growing up. Gerry insists that he doesn’t want a fuss, but gets frustrated and upset when the party is clearly aimed at someone much younger. Trying to pick up the mood, Margo’s transformation of an otherwise disastrous party results in hilarious antics as everyone but Spiros seems to join the party spirit. His distant behaviour concerns Louisa who wonders why he has locked himself in a room to sing sad love songs.