Top Spy Kids Carmen and Juni Cortez are on a new hot assignment from the OSS. Someone has stolen the government's secret Transmooker device, and the Cortezes are off to a deserted island to get it back.

Their spy gadgets don't work on the mysterious island, and the Cortez kids have to deal with their rival OSS Spy Kid agents, sneaky Gary and Gerti Giggles. They need their spy brainpower more than ever. And fast! They have to stop the device from being activated or the world as we know it will end.

Carmen and Juni have no time to lose, and they're not about to let the Giggleses get in their way!