The Atomic Sea: Volume Eight — Jack Conner

Dark times have befallen not only Dr. Francis Avery and his friends, but the entire Ysstral Empire. The world itself is in dire peril. A treacherous duke has usurped the throne and seized the realm for his own, forcing Avery and the others into hiding. On the run, how can they hope to overcome the duke and restore order to the realm? They'd better hurry. The duke's new allies, the evil Collossum, are up to something secret and sinister at the harbor, something that may involve the Sleeper's head. If Avery's band don't retrieve it soon, the Collossum will wield a dread power that will spell the end of humanity and herald a new age of nightmare for the world. But how can they even begin to do this when they're hiding from the duke's secret agents in the ruins of ancient, alien buildings, and being forced to ally themselves with the great villain, Uthua himself, just to survive? And just what is Uthua's agenda, anyway? Plunge into the adventure now to join the fight!