Irwin M. "Fletch" Fletcher is a newspaper reporter being offered a large sum to off a cancerous millionaire, but is on the run, risking his job and finding clues when it's clear the man is healthy.
 
No review.  Just a quote from the movie.
 
Madeline: I'm sorry, who are you again?
Fletch: I'm Frieda's boss.
Madeline: Who's Frieda?
Fletch: My secretary.
 
Nuff said.
 
FUN FACT:  Gregory McDonald, the author of the Fletch novels, had casting approval over the film. He rejected both Mick Jagger and Burt Reynolds before he decided on Chevy Chase for the lead.