Dermot and Maria's wedding is just days away and tensions are running high in the Brown household, as the comedy written by and starring Brendan O'Carroll continues. The groom is getting cold feet and his best man, Buster, can't find anything good to say about Dermot in his speech. To cap it all Agnes Brown is mystified as to why her daughter Cathy has given her a book on homosexuality. Is she trying to tell her mother that one of the family is gay?

When Dermot's pre-marriage nerves get the better of him, he does what he always does when stressed: he locks himself in the cupboard. Father Quinn is bemused to have to give Maria and Dermot their pre-marriage talk in slightly unusual circumstances - with the mother of the groom in attendance and the groom in the cupboard. If Dermot won't reappear for the priest, how on earth is Agnes going to persuade him to come out in time for his wedding?

Meanwhile, Agnes Brown goes on a hunt for the homosexual in the family. Eventually she realises who it is. With help from Cathy and a greetings card, Agnes reassures them, and herself, as only she can.