Iron Triangle (Invisible Six Set 2) (Library Binding)

North Korea attacks South Korea, renewing hostilities after seventy years of relative peace. North Korea has a new and seemingly unstoppable weapon called the Sea Serpent. Zumi and Invisible Six must find a weakness in the Sea Serpents and destroy them to end the conflict. Aligned to Common Core standards and correlated to state standards. Claw is an imprint of Magic Wagon, a division of ABDO.