I have been interested in watching this movie for a long time, because it seemed like an excellent detective thriller.  However, what I found was an incredibly well-acted, dramatic mystery with great characters and story.  This movie simply has it all, and there's almost no major flaws to speak of.  The acting is incredible, as well as the writing for the characters.  This is still a good detective mystery, but the detective aspect of it takes a backseat to a more emotional tale about three friends and their lives.  This is simply a great movie and I don't think anyone would disagree.