A case of mistaken identity leads to accident-prone George Brown (George Formby) entering the Royal Air Force and falling in love with the Sergeant Major's daughter.

At the start of World War II, musician George Hepplewhite (George Formby) gets on a boat thinking he is on his way to Blackpool, but arrives in Bergen, Norway instead, where he is mistaken for another ukelele player. He then meets the desk girl at the hotel, Mary Wilson (Phyllis Calvert), who is a British undercover ag…