The Depths of Barcelunda

The second part of The Twilight Cave Trilogy is called The Depths of Barcelunda.  Here is a summary of the story:

Finnley McDougall wakes to find himself being held as a prisoner in an underground cave in Spain.  He is surrounded by evil gomes who keep him drugged with weird sludgy food.  Far above, his parents think he had died in a tragic caving accident.  But Finn's best friend Hadley Kobayashi believes that Finn is still alive.  With the help of their scruffy, rude, bad-tempered companion, Wullie-The-Mahaar-Gome she sets off to find Finn and rescue them.  They discover a massive underground city where thousands of wicked gomes and some crooked humans are plotting to use Finn for their evil purposes.  If Hadley can avoid being drowned in underground lakes, branded by molten metal, tormented by Wullie's sarcasm, stabbed by poison-tipped gome spears, or crushed in the Rock Pit of Torture and Justice maybe she can rescue Finn and get them all out alive.

Here is the first chapter of the story.  Chapter one is called Strange New Companions