How did this happen? How could a club that hasn't won a European trophy in twenty years so thoroughly capture people's imaginations?
Building the Yellow Wall tells the story of Dortmund's roller-coaster ride from humble beginnings and lean decades to the revolution under Jürgen Klopp and subsequent amazing success and popularity. But it also tells the story of those people who have done as much for the club's profile as any player, coach or chairman - Dortmund's unique supporters.