A group of British tunnelers dig underneath no man's land, from the Allied trenches to the German trenches, and set bombs under the German front in hopes of breaking the deadly stalemate of the Battle of Messines.
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.