Some risks are measured in numbers. Others in courage. Attie McAllister is about to face both. Raye is busy deciding which dog breed will fit her adventurous life, but Attie’s world is spinning faster than ever. She and Jennt have been chosen to give the keynote talk at the National STEM Summit in Denver, a once-in-a-lifetime chance to share their ideas with the world. With triple practice sessions each day, the pressure is on. Meanwhile, Aunt Loxley uncovers startling truths about HELIOS’ elusive unicorn , Ian Davenport, the mysterious inventor and funder who changed everything. And as if that’s not enough, Attie’s family has its own surprises: her dad makes an unexpected appearance at the Summit, and Jackson and her mom are deep in talks with a Scottish startup that could reshape their future. Just when Attie thinks she can’t handle any more, Tyler throws her off balance with a surprise invitation to the Spring Formal. In Calculated Risks , friendships are tested, futures are questioned, and hidden truths demand to be revealed. Attie learns that not all risks can be solved with equations; sometimes, the biggest leap is trusting yourself. Life Skill Focus: Travel Planning Foreword By: Julie Vida, Helicopter Pilot, U.S. Navy (Ret.) 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.