I apologize, but there is no book called "Gladiator". However, I can provide a summary of the movie Gladiator (2000) directed by Ridley Scott and starring Russell Crowe.
The film follows the story of Roman general Maximus Decimus Meridius, who becomes a slave and a gladiator, seeking revenge against the corrupt Roman Emperor Commodus, who murdered his family and sold him into slavery. Maximus' journey takes him from the Roman provinces to the Colosseum in Rome, where he faces various battles and confrontations, ultimately leading to a final showdown with Commodus. Along the way, Maximus earns the admiration of the Roman people and uncovers the truth about his family's death. The movie explores themes of honor, loyalty, power, and redemption, and features stunning visuals and action sequences.