Old Grumbly, a massive volcano that looms over the Urk valley, has begun to rumble and many Urks fear The End of the World is nigh. They agree that the only way to avoid catastrophe is for someone to climb the volcano and make an offering to the ancestors. Preferably, this someone should be the Urk selected to succeed Chief Hammerhead at the momentous Anointing Ceremony ...which just so happens to be Iggy. Now Borg can implement his latest plan to snatch control of the Urk tribe for himself, with the help of the Noneck tribe we met in the first book in the series, Oi, Caveboy!. It's time for Iggy to come up with a cunning plan.