In August 2014, Jim Gavin's Dubs seemed unstoppable. They were playing football at a level not seen in years – overwhelming opposition and seemingly growing stronger with every game. Nobody saw it coming: Donegal's beautifully timed semi-final ambush. The Ulstermen laid bare a chink in the Sky Blues' armour; a tactical hole which Gavin immediately set about filling. Dublin would not lose a championship game again for 2,540 days ... Eric Haughan deep-dives into Dublin's seven years in footballing nirvana, an era of dominance and drama in which Gaelic football changed forever. Reviewing crucial matches and speaking to players and backroom staff, he pieces together the story of arguably the greatest side the game has ever seen ... and the teams who tried to catch them.