Kevin Hurley and his earthy twin sister Maureen - who share a remote Irish farmhouse with their bedridden, aged father -have been secret but unashamed lovers for thirty years, ever since their mother's agonizing death from cancer. But now, at 40, Maureen is pregnant, refusing either to go away or to have an abortion. So, to prevent the neighbors from drawing scandalous conclusions, Kevin must find Maureen a partner.