From publisher blurb:
An Into the Wintery Gale Mini-Dungeon adventure for four to six PCs of levels 11-12.
This mini-dungeon is intended for use with the Into the Wintery Gale: Wrath of the Jötunn Adventure Path, but may also be run as a standalone quest.
In this adventure the party is seeking information about an ancient artifact known as the Sorrow’s Snekkja. Vikmordere legends suggest that it can be used to quell the evil which dwells within Serpent Lake, but provides few hints of its form or whereabouts.