John Lutz: Lazarus Man (USA 1980)

From the Publisher:
Wilson Capp is an honorable man in a dishonorable profession.
While the others involved in the notorious Gateway scandal that toppled a President told all and made their fortunes, Wilson Capp kept the faith, kept his silence... and was rewarded with prison.

Now Wilson Capp is free. And he's out to make his former associates pay the ultimate price for their betrayal. Each victim crossed off his list brings him one corpse closer to his final target...

The supreme master of dirty tricks himself...
The ex-President of the United States!

John Lutz: Lazarus Man. A Novel. Berkley Books, ISBN: 0425045447 (August, 1980), 232 p.,$2.50.