This movie is not for the weak of mind. The plot is complex. I remember reading reviews that used words like "murky." Since the movie was a bit more complex than cops chasing robbers around some city at high speed most critics lack the intellectual wherewithal to keep track of what is going on.
Beginning with a friend's murder in Los Angeles Lt. Barney Caine, LAPD, (George C. Scott) follows a trail which takes him to Europe and leads to a formula for turning coal into gasoline. It takes Caine a while to uncover this and the plot takes a number of twists and turns. The ending can only reinforce one's cynicism about how the world works.
The performances are strong and the movie is well worth the time taken to view it.