Tyra’s nose bristled at the smell of death as they entered the clearing. A dark entrance in the hillside beckoned to them even as it repelled their every sense.

The low, narrow tunnel forced them to crawl, single file, through stone that looked more torn than carved by man. Elisa took up the rear as usual, and she was secretly glad that the others’ passage had rubbed some of the slime off the walls in front of her.

After what seemed like ages, Olazabal’s keen eye detected a dim light at its end. Just then she felt a low rumble in the stone. Recognising the growing sound, she cried out in warning. Elisa and Tyra scrambled quickly forward as rocks pelted down behind them. In no mood to dally in such a dangerous tunnel, the three of them crawled hurriedly forward towards the unsure light…