In this sixth installment of the Cloudland series, Cloudland & Darkland Exposed, an old foe bearing a grudge has returned. But the Blueworld kids don't know that yet, they just know that lightning has struck an active volcano in the western Pacific Vanuatu Islands. The eruption has made Cloudland and Darkland visible, attracting a nosy helicopter to Darkland. And if there's a bigger eruption, the whole planet is in danger! Somehow, the kids have to deal with the madman on Darkland, and a dangerous dude and his superstitions in Vanuatu. And in both places lurk some of the most terrifying creatures they have ever faced. The stakes are high and the odds are challenging, but can they return things to normal?