Lincoln and Louisa return to the magical forest determined to help Solfern-and to reach the mysterious cloudline that hangs like a glowing ribbon across the sky. But getting there won't be easy. The winds have grown unpredictable, the gray dust is spreading, and the only way forward is to build something that can carry them safely above the shifting forest floor.Using memories of a family hiking trip, Lincoln sketches out a plan for a glider, while Louisa imagines how magic might help it soar. Together, the siblings experiment with lift, shape, and balance, learning how air can hold a wing aloft. When their final design takes flight, it lifts them into a breathtaking world of swirling clouds, sparkling light, and strange new dangers hiding in the heights.The Cloudline Crossing is a thrilling, STEM-rich adventure in The Prism Stone Adventures, perfect for readers ages 5-8. Blending real science with heartwarming fantasy, this book celebrates creativity, problem-solving, and the magic that happens when imagination takes wing.