The elves of the Mierani Forest have been hiding something from outside eyes for hundreds of years, but now, this sinister secret has escaped! What at first seems to be a sudden uprising in unsanctioned banditry in the Riddleport hinterlands is in fact something altogether more sinister - the dark elves have come to Varisia. Yet the threat presented by the drow from below may be nothing compared to a new threat from the skies above. Can a new group of heroes save the world from the coming of the Second Darkness? This volume of Pathfinder kicks off the new Pathfinder Adventure Path campaign - Second Darkness - and presents a detailed gazetteer of the intrigue-filled streets of Riddleport, reveals for the first time the nature of Pathfinder's drow and their hidden secrets, and presents a half dozen new monsters native to the Riddleport region.