As the story goes you're a firestarter, or secret agent, or something, and there's a burning building, which you can enter through the windows. Each window has a different level.
The goal is to grab the briefcas at every level.
I had this game on my Commodore 64, and never could finish any of the levels.
Here is the game:
http://www.gamebase64.com/game.php?id=10127&d=45&h=0
Easily The Hardest Game Of All Time if you ask me.