In 1990s Scotland, a group of Catholic school girls get an opportunity to go into Edinburgh for a choir competition, but they're more interested in drinking, partying and hooking up than winning the competition.
Followed by Tony Towers, he's a local celebrity, a successful nightclub manager and he is engaged to a younger woman, Sue. Things get a little strange when he embarks upon the 3:17 to Nottingham for a Christmas family reunion.