On the trail of a powerful ancient enemy, the adventurers seek more information in a merfolk city and must carefully maneuver the social currents of the underwater city and unravel dangerous intrigue to get to the bottom of the merfolk`s plot and discover where the ancient enemy is headed. Continuing the Ruins of Azlant Adventure Path, City in the Deep is a Pathfinder Roleplaying Game adventure for 10th-level characters.