So Long, and Thanks for All the Fish

Alternate cover editions for this ISBN can be found here and here.

From The Hitch Hiker's Guide to the Galaxy:
"...and then, one Thursday, nearly 2,000 years after one man had been nailed to a tree for saying how great it would be to be nice to people for a change, a girl sitting on her own somewhare in Rickmansworth suddenly realised what it was that had been going wrong all this time, and she finally knew how the world could be made a good and happy place. This time it was right, it would work, and no-one would have to get nailed to anything.

Sadly, however, before she could get to a phone to tell anyone about it the Earth was unexpectedly demolished to make way for a new hyperspace by-pass, and so the idea was lost forever.

This is not her story..."

But So Long, and Thanks for All the Fish is.
At least partly...
Arthur Dent finds her in the las place in the univers he would expect to fine anything but which 3,979,000,000 people will find oddly familiar...
(back cover)