What's the Name of That Book??? discussion

My brother read this in the 60s or 70s. There has been some sort of cataclysm. A man and a woman have been hired by the US Government to develop a machine to control and cause earthquakes. Their lab and machinery is very remote and kept inside an actual pyramid.

The man and woman are brilliant scientists, but to maintain their extreme longevity and intelligence, they require human flesh due to a genetic problem. They have a psychic black panther named "Greedy Guts" who, when the necessity arises, goes hunting for likely looking meals, providing delivery to the couple. He also recalls a psychic bad guy named Boon or Bodane and a Mountain King who might fly.

There is a possibility that the word "Pumpkin" might be in the title and my brother is clueless as to why he was reminded of Usher.

Bump!
The man and woman need cannibalism to stay alive and Greedy - Guts - the -Panther brings them victims.
Something about the plot reminded my brother of The Fall of the House of Usher. The character of The Mountain King might be a good guy, but he just can't remember how it ends. It really stuck in his head that the scientific work to create earthquake machines was done in a building shaped like a pyramid.

Here, Usher’s Passing by Robert McCammon.

https://www.goodreads.com/book/show/1...

http://brianbookreviews.blogspot.co.u...

This book has a black panther called Greediguts, an entity known as The Pumpkin Man

It does have earthquakes, secret weapons projects, a Mountain King, Edwin Bodane, and a twenty-foot-tall gilded pyramid that was the final resting place of Hudson Usher.

Banjomike, that's it//////////////////// Thanks so much. Not sure what to do now. Could some kind person show me and then I'll know!?
Thank you again,
Lisa

Hi Lisa, we shelve the book by going to bookshelf, typing in the book and pasting the web address in the comment box. Then on this page, click on the edit button next to your name and change the folder to solved -- whether it's adult or young-adult/children.
Now you know for the next book. I'll go ahead and do it for this book!
Congrats!