What might the tunnel hold? How far would the subterranean trail lead? Jessica considered these questions as they drove into the dark underground, where the headlights revealed nothing but rock and old mining equipment.

"Where exactly are we going?" said Shannon, glancing at the passenger seat. "Oh, c'mon!"

Raptor was asleep.

"That's just great timing," said Valerie.

"Unlike us, I don't think he got any sleep this morning," said Jessica. Nevertheless, ...