The family plan a party to celebrate Gerry's 13th birthday, but they are forced to hold it inside when a plague of mosquitoes descends. As the party planning progresses, Louisa finds it difficult to accept that her youngest is growing up. Gerry insists that he does not want a fuss, but he gets frustrated and upset when the party is clearly aimed at someone much younger. Meanwhile, Louisa is concerned by Spiros's behaviour.