Brain by Robin Cook

Both of them suspected that something was wrong–terribly wrong–in the great medical research center where they worked. Both of them wondered why a beautiful young woman had died on the operating table and her brain secretly removed. Both of them found it impossible to explain the rash of female patients exhibiting bizarre mental breakdowns and shocking behavior. Both of them were placing their careers and very lives in deadly jeopardy as they penetrated the eerie inner sanctums of a medical world gone mad with technological power and the lust for more.