When the stars begin to hum above Cedar Creek, the Firefly Five know adventure isn't done with them yet.

Sidney, Judy Faye, Billy Lloyd, Linda Nell, and Kay Beth return for their most breathtaking journey yet — one that leads them deep beneath the hills of Willow Bend, where a mysterious machine called The Light Engine lies waiting to be awakened. But when rival explorers, the Iron Hawks, follow their trail, teamwork becomes their only hope for survival.

A forgotten inventor named Cutter left behind clues hidden in starlight — a cipher that can only be solved when friendship burns brighter than fear. To restore balance to the Radiance, the Fireflies must unite old enemies, face a roaring underground flood, and decide what they're willing to sacrifice to protect the light that connects them all.

Packed with heart, humor, and nonstop adventure, The Secret Beneath Cedar Creek is a story of courage, unity, and the power of believing in one another when the night grows darkest.

Book 3 of 10 in The Firefly Five Adventures Series — perfect for readers ages 7–12 who love mysteries, hidden tunnels, and brave friendships that shine as bright as the stars themselves.