Your Worst Nightmare: You're Invited to a Creepover (PB), cartea 17

The seventh graders at Jefferson Middle School are superexcited to be going on their first-ever, overnight class trip to the famous Ravensburg Caverns. But what they don't know is that there are local rumors about the Ravensburg Caverns. Rumors that a group of kids one hundred years ago got trapped in the caves and never came out. Legend has it that if you listen closely, you can still hear the echoes of their cries. And unfortunately for best friends Kristi Chen and Olivia Pappas and a few of their friends, their fun trip away from home will take a turn for the worse when they stumble into the same trap--only to discover that their worst nightmares have come alive...

This frightening fable is rated a Level 5 on the Creep-o-Meter.