Titus watches for trouble. Franzi prepares for it.When three bullies sneak into a forbidden cave on a school trip to the Smoky Mountains, the twins follow—thinking they might prevent disaster. But inside, the cave holds dangers they never imagined: a glowing lagoon hiding a river that never stops, a mother bear fiercely protecting her cubs, and every step more perilous than the last.What began as a mission to keep the bullies out of trouble quickly turns into a fight for survival. In the wild, lessons are learned the hard way—and not everyone will make it out unscathed.