A CIA agent for an unknown reason is issued a Burn Notice, ie. meaning fired. But the CIA doesn't just give you a pink slip, and let you take your skills elsewere. They destroy your history, your finical records everything and strand you in a city of their choosing.
So he's stranded in Miami and he wants to know why he was burned. In the course of tracking down clues, he inadvertently helps out people with their problems. (Like getting revenge on a scammer, who hurt a friend of his mother, so that his mother would tell him some vital information. etc)
It's a pretty funny show, and It's got Bruce campbell in it. So how could it go wrong