How did one of the world's biggest sporting brands end up in such a financial mess? FC Barcelona's collapse, from European Champions League winning juggernaut, to unable to register its players under salary cap rules took less than a decade. So how did it take so little time for one of football's giants to fall so hard? We explore that with club members and supporters, as well as the Financial Times journalist Simon Kuper, the author of a new book about Barcelona; Barca, the Inside story of the world's greatest football club.Picture credit: Getty Images