Coma — Robin Cook

They call it 'minor surgery,' but Nancy Greenly, Sean Berman, and a dozen others, all admitted to Memorial Hospital for routine procedures, are victims of the same inexplicable, hideous tragedy on the operating table. They never wake up again.

Some traceless error in anesthesia has caused irreversible brain death, leaving each of them in a hopeless coma. Something is very wrong here. And Susan Wheeler, a beautiful young medical student, hazards her life to uncover the horrifying explanation - a plot so ghastly, so far-reaching, so terrifyingly incredible, yet so nightmarishly possible, it will leave you suspended in a state of fear...