Six Days of the Condor Robert Redford

Ronald Malcolm is a CIA employee who works in a clandestine operations office in Washington, D.C. responsible for analyzing the plots of mystery and spy novels. One day, when he should be in the office, Malcolm slips out a basement entrance for lunch. In his absence a group of armed men gain entrance to the office and kill everyone there. Malcolm returns, realizes he is in grave danger, and telephones a phone number at CIA headquarters he has been given for emergencies.