Magic is stirring, and danger is closer than ever… Summer should mean freedom and fun, but for Cassie, it brings a mission unlike any other. Gifted with the ability to sense thoughts and connect with the natural world, Cassie knows secrets most people can’t imagine—and this time, she must protect them at all costs. When treasure hunters arrive, following Dr. Blake’s published papers, they’re determined to uncover what lies hidden beneath her family’s land. Cassie, her invisible dog Patrik, and their new puppy Pixie must act quickly to secure the bridges of energy that guard powerful instructions for crystal transmutation and plasma star energy. If the intruders succeed, the balance of nature—and the safety of their world—could be destroyed. But guarding secrets isn’t easy when danger closes in, storms rage, and even friends are tested. Alongside magical trees, enchanted caverns, and the mysterious voices of the natural world, Cassie will discover the true strength of her gifts—and the courage it takes to trust in love, friendship, and herself. The Connective Caverns is the thrilling third book in the Behind the Open Door middle grade fantasy series, where imagination meets mystery and adventure lives just beyond the threshold. Step through the open door—and see what waits within.