novel by Gordon R. Dickson
From the back:
"The Timestorm had devastated the Earth, and all but a small fraction of humankind has vanished. In the rubble of the world, three survivors had formed an unlikely trio. Marc Despard, determined to find a way to stop the time storm; a leopard, dazed by the storm and following after Despard like a kitten; and a young woman with an unbreakable bond to the leopard."
"Now, Marc searches relentlessly for a clue to the nature of the storm, not guessing that the time storm threatens not just the Earth, but the entire universe - and that his two companions were the only hope of reversing the distortions in the fabric of the cosmos that were about to bring an end to all of space and time ..."
First published in 1977, this novel came into my hands in 1992 in the form of a republishing by Baen Books, for only $4.99. Despite the slight hokeyness of the backflap text, this is a really great book. Well paced and well balanced, you are actually disappointed to reach the end. If you are into survivalist, after the apocalipse books, you would love this one.
Other books by Gordon R. Dickson:
The Last Dream
None But Man
The Lifeship (with Harry Harrison)