Lawrence Sanders has written wonderful stories that might fit the request.
Edward X. Delaney series:
The Anderson Tapes (1969)
The First Deadly Sin (1973)
The Second Deadly Sin (1977)
The Third Deadly Sin (1981)
The Fourth Deadly Sin (1985)
The Commandment series:
The Sixth Commandment (1978)
The Tenth Commandment (1980)
The Eighth Commandment (1986)
The Seventh Commandment (1991)
Exceptional the Timothy Cone series:
The Timothy File (1987) [collection]
Timothy's Game (1988) [collection]
Among the stand alone titles, I recommend:
The Tomorrow File (1975)
The Passion of Molly T (1984)