Zelef Eryx serves his Freeguild as a Whisperblade—a spy and enforcer charged with rooting out danger and corruption among its ranks. When a mysterious threat puts Lethis, the Raven City, at risk, Eryx joins a crusade into the darkest depths of Shyish. Its goal: find the lost fortress of Udriste and uncover the legendary weapons and knowledge that could save Lethis, if the fortress still stands.