From publisher blurb:
The beguiler will steal your heart and just maybe literally kill you with kindness.
The beguiler is a new character class for the early editions of the world's first roleplaying game, a sub-class of the thief and the assassin's more lasivious cousin.
Although primarily meant for the first advanced edition, it also includes tables for the original and expert versions of the non-advanced game.
Also included are a dozen or so sample NPCs.