In 1977, in a Northern England town, eighteen year old Vince Smith works as a lowly clerk in a legal firm. He is painfully shy and can't bring himself to stand up to his overbearing boss or to ask out his beautiful co-worker Joanna. Vince's father, Harold is a retired clerk who likes the quiet life, while his wife prefers a more rigorous nightlife, especially in the company of well-built young men. Vince is oblivious to it all as his attentions are firmly focused on disco and emulating the moves of his hero John Travolta. One Christmas Day, Harold performs a party trick that astonishes the entire family. Vince has life turned upside down when his father's unlikely knack for performing mysterious tricks catapults the Smith family into the limelight and he meets an exotic punk girl.