Book 3 in James Moloney's page-turning Doomsday Rats series. Berrin has been one of only a handful of humans to escape the control of the evil Malig tumora. But when Berrin emerges onto the creek bank after a scorpion-like cannon has flooded the tunnels, Malig tumora's servants, the gruesome-looking Gadges, recapture him. Imprisoned within Malig tumora's menagerie, Berrin meets Aden, an unusual boy with a powerful learning ability. together, the boys face many challenges as they complete a serie