Mrs. Cat-biscuit's Search for the Downward Land
by Chris Wardle
(Suggested reading level: Grades 3-6)
This fourth book in the series starts with the two cats, Mr. Ginger and Mr. Choli, waking from a nap when the car they sleep in slides downhill, stopping beside Mr. Vinegar's cottage. It's an earthquake! Thankfully, the only other damage in Daphne Wood i a collapse at the entrance to the mine, which is quickly taken care of. In an interesting turn of events, though, the land has been raised much higher than sea level.
In typical colony fashion, two expeditions are formed. The first, led by an excited Mrs. Cat-biscuit sets off in the boat searching for an area where the land has gone down. After all, when something goes up, like their shore, something else must go down. What they find though, is an oil spill caused by the quake. The humans are still wreaking havoc on the environment, even after they've become extinct.
The second expedition...