I'm not familiar with the Book, but its a great film.

Rating: 8/10 (22 January 2005)

Will Smith, a cop living in a world where robots are part of every day life for many people, is called to the scene of a suicide by his dead friends hologram. Only programmed to give the appearance of intelligence the hologram's purpose is unclear, but is enough to sow the seeds of doubt in Will Smith's already suspicious mind.
Investigating a murder he believes was perpetrated by a robot, Smith proceeds to pursue the robot in question, revelling a whole lot more than he would have wished for, and discovering a great deal more about his foe than he expected.
Stunning visuals, fast paced action and plenty of decent surprises all contribute in making this a fine Sci/Fi Thriller, thats not quite as good as the hype but still well worth a watch.
8/10