Richard Leventhal, a failed writer, goes on vacation to Egypt, but his ship is wrecked. Upon waking up, Leventhal realizes that the temperature has become extremely high and the ocean has dried up. Wandering through the desert, he finds a ruined settlement consisting of tall columns and huge glass domes. Later, he finds the Egyptian pyramids, which turn out to be upside down.

  A portal appears between the three pyramids, from which a square platform flies out. Strange creatures stand on it: human-sized toads dressed in suits and cylinders with umbrellas in their paws.

 As we learn later, all living creatures, including humans, died out millions of years ago. Only frogs and toads survived, and they evolved millions of years later to create an entire civilization, the pondfolk. Recently, however, a new scourge, Solar Madness, hit the Earth, drying up all the oceans and causing temperatures to reach their highest levels. Because of this, the Pondofolk have been forced to move to another world whose portal opens between three pyramids.  

 Suddenly a squad of pondfolk begins to hunt Leventhal, the last living human. The writer manages to escape for a while, but now he faces a difficult question: will he be able to find help and return to his own time?