International bankers corner all the markets and plot to take over the world.  I read it in the 70s or 80s and I think it might have been a Robert Ludlum book.

Looking for a book by a first time author, Harvard grad. Outstanding effort. I believe it was a political or medical thriller. A car (limo or cab) explodes in an assassination attempt but there’s no debris, just vapor or dust. That’s one scene, not sure it’s the actual plot. Late 1990s.