From publisher blurb:

For years, trade and travel along the river Thadysh have been peaceful. Suddenly a masked renegade, known only as the Gullwing Bandit, has turned the waters of Thadysh into a pirate stream. Who is this bandit? What nefarious plot is he weaving? Not even the local thieve's guild has been able to unveil the truth.

"Thief's Challenge" is a special ADVANCED DUNGEONS & DRAGONS adventure designed for a DUNGEON MASTER and one thief player character. It's a perfect break from group play, tailored to the character who's seeking some extra experience. Suited to clever beginners as well as more experienced rogues, "Thief's Challenge" lets a thief take full advantage of his special talents.

Can you unmask the Gullwing Bandit? The reward is great, but beware: adventure and danger await at every turn of the river!