In the movie, Johnny is unjustly imprisoned by this nasty judge -- when he's out of the joint all he wants is revenge. Helena helps him out.
Again, the acting is superb, but I didn't really like the songs. The movie is good but could have been much better. I think the plot should have us see more of Johnny's perfect little life before his imprisonment so that we could better taste his revenge. As it is, the movie feels almost gratuitously gory -- revenge for revenge sake. Just my two cents...you should still see the movie.