Carbon dioxide is out of control on Earth, and the fate of humankind rests in the paws of four experimental, untested Animal Astronauts (AlphaWolf, SmartHawk, LaserShark, and StinkBug) who are seeking another habitable planet; first destination is the Plant Planet which at first looks perfect, except that the abundant plant life can think for itself--and it thinks that it really does not like the AstroNuts.

The continuing story of the residents of the planet Donovan as survival becomes more of a struggle. On the planet Donovan, resources are dwindling, technology failing. Supervisor Kalico Aguila has bet everything on a fragile settlement far south of Port Authority, carving a farm and mine out of wilderness. Then a murderous peril descends out of Donovan's sky-- one that will leave Kalico bleeding and shattered. Talina Perez gambled her life and reputation...

On their second mission to find another habitable planet, the four mutant animals, LaserShark, AstroWolf, SmartHawk, and StinkBug, splash land on the Water Planet, run by some suspiciously friendly clams, who are very eager to swap planets--and if the AstroNuts can stop arguing among themselves they may find out why before it is too late.