Spring has arrived in Rocket City, and fifteen-year-old inventor Attie McAllister is discovering that some problems can't be solved with engineering. While she struggles to find the perfect dress for the Spring Formal, much bigger challenges are brewing around her. When Attie's mom is mysteriously removed from a crucial NASA mission, and Jackson receives a classified offer that could change everything, the family finds itself at the center of a decades-old conspiracy. Hidden in the archives of the Davenport Family Foundation, Attie and her friends uncover encrypted messages that lead to a revolutionary hydrogen engine design—one that could transform space exploration forever. But they're not the only ones searching for these secrets. As the threats escalate from Huntsville to the Scottish Highlands, Attie and her friends are thrust into a globe-spanning conspiracy. But first, Attie must navigate her first formal dance, support her best friend Raye's solo flight certification, and help her family make impossible choices about duty, conscience, and the future of clean energy. With her characteristic blend of scientific curiosity and determined problem-solving, Attie discovers that her Granddad Sam left behind more than just memories; he left the final piece of a puzzle that could either save the world or destroy it, depending on who controls it. Life Skill Focus : Business Pitch Foreword By: Dr. Rhonda Kay Gaede, University of Alabama Huntsville Meet the Series That’s Inspiring Girls Everywhere! Book Order 1 Rocket City Love – Every inventor’s story starts with a spark. 2 Tick Tock, Take Charge! – Adventure doesn’t come with a pause button. 3 Where Clues Take Root – Decode the past. Protect the future. 4 Blueprints & Buried Truths – From hidden ciphers to hydrogen power, the secrets of HELIOS rise. 5 Calculated Risks – The formula for courage: friendship + truth + risk. 6 The Gravity of Choice – Decisions have gravity. Attie’s could shift the future. 7 Legacy Protocol – HELIOS was never lost—it was waiting for her. Download & Learn by Doing — Just Like Attie Each book includes a download (available at the Charms Book Series website) to help readers apply Attie’s real-world life skills: time management, leadership, budgeting, pitching, and project planning. Learn by doing and see how STEM and storytelling connect! Your Purchase Makes a Difference By purchasing this book—or any Charms merchandise—you’re supporting Athenian , a STEM edu-tainment nonprofit dedicated to empowering girls through hands-on learning, storytelling, and real-world adventure. Every Charms purchase fuels our mission to build confidence, character, and curiosity in the next generation of innovators. Together, we’re shaping the future—one story at a time. If You Like: Tree House Mysteries, The Baby-Sitters Club, Nancy Drew, Carole Marsh’s mystery books, National Park Mystery Series, The Math Inspector series, then the Charms Book Series is the natural next step. Those favorites deliver friendship, adventure, and curiosity and Charms keeps that same feel while leveling up for ages 8–14 (grades 6–9) with older characters, deeper thinking, and real problem-solving. This juvenile fiction / middle grade chapter book series for girls blends mystery and STEM-ready curiosity with life skills like decision-making, confidence, responsibility, and leadership making it perfect for reluctant readers, libraries, book clubs, and parents who want fun, safe stories that quietly strengthen literacy. Still funny. Still wholesome. Just a little more “you’ve got this” and a lot less hand-holding.