The Serpent's Fang

From Introduction: In The Serpent’s Fang the PCs find themselves looking for shelter in the rough sea-port of Lothin (though any harbor town will do, feel free to change facts to suit your campaign). A night spent carousing ends in trouble as the group is press-ganged by ruthless pirates and forced to serve upon their ship; accompanying the salty brigands in their quest for the legendary treasure of Yarrab McPhail, a buccaneer of fame and fable. Chief among the possessions in McPhail’s horde was the mythic Serpent’s Fang, a dagger of great magical power.