From the back cover:
An insidious peril threatens the peaceful kingdom of Wendar. When a traitor stole the realm's greatest treasure, a magical Elvenstar, disease, drought, and famine struck the land. For the first time in decades, hostile armies were poised to invade Wendar.
Yet even greater danger looms. The traitor has delivered the magical gem into the hands of the Shadow Lord, Wendar's greatest foe. This evil being has returned from the dead to seek revenge on Wendar, and the Elvenstar is the key to an even more sinister foe.
You must evade the Shadow Lord's army, penetrate his fortress, recover the Elvenstar, and foil this heinous plan!
This adventure is for use with the DUNGEONS & DRAGONS Basic and Expert Rules produced by TSR, Inc. You must have both rule sets to play the adventure.