Executive Privilege by Phillip Margolin

Private detective Dana Cutler is hired by an attorney with powerful political connections to follow a college student named Charlotte Walsh, to report on who she sees and where she goes. At the same time across the country, Brad Miller, a junior associate in a huge law firm is given a pro bono appeal of a convicted serial killer, Clarence Little. Little admits to some of the murders, but claims innocence of one that will bring Dana and Brad together on a search for a murderer that appears to be a member of the White House. They need to stay alive to do it. A fairly good read, seems like it could happen. Sandy P