Milk

In the cavernous depths of a mountain lies a lake of pure milk, inhabited by a tribe of peaceful merfolk. Their king and queen, aided by dwarf servants, use the milk to manufacture the most exquisite chocolate truffles in existence. The truffles are said to be so delicious as to soften even the most hardened of hearts. People from all over the world visit the lake to buy these irresistible creations.

Recently, truffle production has mysteriously ceased, the dwarves have disappeared, and in nearby cities, scores of disreputable merchants have begun hawking inferior products said to be created in the mountain.

Can our heroes uncover the truth about what is going on under the mountain?