The US military is under cyberattack. Computer failures have crippled every weapons system. Gizmo and Invisible Six must discover who is behind this attack and the culprits' aim. But the mysterious hackers seem one step ahead of I-6 at every turn, and their use of autonomous weapons keeps I-6 from getting close. Can Gizmo and I-6 stop the worst cyberattack in US military history? Aligned to Common Core Standards and correlated to state standards. Claw is an imprint of Magic Wagon, a division of ABDO.