This book is the novel that launched two films. The paperback I have is not a true tie-in since it doesn’t have the stars of the original on it, but it does mention that it will soon be a major motion picture.
The book hinges on four guys who take a subway train hostage. It’s gritty seventies suspense, and seems somewhat dated because these days we expect more dastardly plots than the lives and deaths of sixteen hostages. The book bounces between scenes and characters and occasional flarings of violence.
Frankly, I don’t see how you make it into a movie featuring Mattheau or Washington, since the dispatch cop isn’t a featured player, but there you go.
Good piece of writing. I enjoyed it, but it does seem dated.