From the back cover:
"The king is dead!
And the queen is in trouble. She has chosen you to find the fabled heartstone, which is buried somewhere deep in the Mountains of Ice.
Is the gem in the hands of the corrupt Master Thief? Has he harnessed its power for its own vile purposes? Or does it lie unguarded in the frozen ranges to the north, which teem with horrible creatures?
This is your kind of quest!
Quest for the Heartstone is a combined wilderness/dungeon adventure designed to be campatible with the ADVANCED DUNGEONS & DRAGONS Action Toys from LJN Toys, Ltd. and the ADVANCED DUNGEONS & DRAGONS Fantasy Adventure Figures from TSR, Inc. The adventure also includes complete maps, new monsters, and players' illustrations.
Will the hearstone be the key to peace in the kingdom? By her majesty's request...it's up to you to find out!"