Tension and plot twists abound in this farfetched but supremely entertaining spy story about a group of agents, who may or may not be what they appear, infiltrating a Nazi fortress. Richard Burton and Clint Eastwood give solid, likeable performances and work well together. A significant flaw is the film's conclusion -- the climax is not immediately recognizable as such, leaving the viewer wondering during the final resolution, "Is the fun really all over?" Consequently, the movie can leave you feeling mildly hollow -- yet with this word of warning, it shouldn't be so bad. If you're looking for fast-paced wartime adventure, look no further.