My guest is Kit Holden whose new book covers the complex history and recent rise of 1. FC Union Berlin. This fascinating club from Berlin's southeastern suburbs has something of a cult following and is now enjoying regular European football. How? Find out here...
I discuss the past, present and future of Europe's most-attended football club, Borussia Dortmund, with Benjamin McFadyean, who also runs the London supporters' group for BVB.