Coleman Reese, an accountant at Wayne Enterprises, deduces that Bruce is Batman and tries to go public with the information.Not wanting Reese's revelation to interfere with his plans, the Joker threatens to destroy a hospital unless someone kills Reese.He says that he will blow them both up by midnight, but will let one live if its passengers (who have been supplied the trigger to the other boat's explosives) blow up the other.Batman finds the Joker by using a sonar device that spies on the entire city, with the reluctant help of Lucius Fox.The Joker threatens to keep killing people unless Batman reveals his identity, and starts by murdering Police Commissioner Gillian B. The Joker also tries to kill Mayor Anthony Garcia, but Gordon sacrifices himself to stop the assassination. Dent is taken into protective custody, but the Joker appears and attacks the convoy.Batman comes to Dent's rescue and Gordon, who faked his death, apprehends the Joker, securing a promotion to Commissioner.The Dark Knight is a 2008 superhero film directed, produced, and co-written by Christopher Nolan.
Mob bosses Sal Maroni, Gambol, and the Chechen hold a videoconference with their corrupt accountant, Lau, who has taken their funds for safekeeping and fled to Hong Kong.
Gordon orders the evacuation of all the hospitals in Gotham and goes to secure Reese.
The Joker gives Dent a gun and convinces him to seek revenge for Rachel's death, then destroys the hospital and escapes with a busload of hostages.
Both buildings explode, killing Rachel and disfiguring half of Dent's face.
The Joker escapes with Lau, whom he later kills along with the Chechen.