Sam Raimi may be most at home with Horror, but his body of work in the last three decades has encompassed a variety of genres, the most intellectual of which is drama. One could argue that a Simple Plan is Raimi's smartest picture but it is not a film where we see any of his distinct auteurism. Equal credit for the film's reasonable competence goes to novelist Scott Smith, adapting his own novel for the screen.
The plot bears some close resemblance to Fargo. One could argue that A Simple Plan is a few steps ahead of the Coen Brothers. It feels far less contrived, and has a bigger heart. Fargo is cold, cynical, but definitely creative. Anyway, that is another movie
Three buddies find a plane wreck in the woods, and inside is a sack containing four million dollars. They agree to keep it hidden until they are convinced that the police are not looking for it. Sounds simple enough, but things get ugly pretty quickly.
I've never thought much for either Bill Paxton or Brigit Fonda, but A Simple Plan shows them at their best, although Billy Bob Thornton's is the most accomplished performance of the movie.
The movie is one worth seeing, it is admirable and thought provoking. There is nothing necessarily unique about it, but then again uniqueness is a rare gift for a movie to have.