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Itch, Lucy, Jack and Tim take the rock to the Mining Institute for further testing in a bid to help Cake, but the group risk losing the rock when the Bikers try to take it.
Greencorp discover the rock's missing and Flowerdew goes to desperate measures to get it back. Itch has a run in with some of the Bikers, and Cake, sick with radiation poisoning, tells Itch the rock must be destroyed.
After the group are rescued from the Mining Institute, they escape Seaburgh with Flowerdew and the rock, only to become stranded when Flowerdew steals the rock, leaving them helpless and lost.
Itchingham Lofte is halfway to his goal of collecting all the elements in the periodic table when he's given a lump of something radioactive identified as element 126. It could either change the world..or could it destroy it?