The story is narrated by Nick Carraway, a grounded young man who moves to Long Island, New York, in the summer of 1922. Nick rents a small house in a wealthy area called West Egg, right next door to a colossal, palace-like mansion owned by Jay Gatsby. Gatsby is a mysterious, handsome millionaire who throws wild, incredibly expensive parties every single weekend. Hundreds of rich and famous people stream into his house to drink, dance, and listen to jazz music, yet no one actually knows who Gatsby is, where his wealth comes from, or why he never joins his own parties.
As Nick gets pulled into this world, he learns a shocking truth from his friend Jordan Baker. Gatsby’s entire empire, his massive house, and his grand parties are all built for one single purpose: to catch the attention of Nick’s cousin, Daisy. Five years ago, before Gatsby went to fight in World War I, he and Daisy were deeply in love. But Gatsby was poor, and Daisy’s wealthy family pressured her into marrying Tom Buchanan, an incredibly rich but arrogant and unfaithful man. For five long years, Gatsby has stared across the bay at a tiny green light at the end of Daisy’s dock, dreaming of winning her back.
Nick agrees to help Gatsby by inviting Daisy over to his small house for tea, without telling her that Gatsby will be there. The reunion is awkward at first—Gatsby is so nervous he almost knocks over Nick’s clock—but soon, the old spark ignites. Daisy is overwhelmed by Gatsby's wealth, his beautiful house, and his undying devotion to her. They begin a passionate, secret love affair.
However, Gatsby’s romantic dream goes too far. He doesn’t just want Daisy to love him now; he wants to erase the last five years completely. He demands that Daisy confront her husband Tom, look him in the eye, and say, "I never loved you." Gatsby believes that with enough money and power, a person can completely repeat the past and fix any mistake.
The tense situation explodes on a burning hot summer day when Tom Buchanan confronts Gatsby in a private suite at the Plaza Hotel in New York. Tom has grown suspicious of his wife’s behavior. In front of Daisy and Nick, Tom viciously attacks Gatsby's character, exposing his grand illusion. Tom reveals that Gatsby did not inherit his money from a wealthy family as he claimed; instead, he became a millionaire through illegal bootlegging (selling illegal alcohol during prohibition) and organized crime.
Daisy is terrified and shocked to see Gatsby lose his calm, polite mask as he erupts into a furious rage during the argument. Realizing that Daisy is slipping away from him out of fear, Gatsby tries to defend himself, but Daisy retreats into her shell, unable to handle the intensity. Tom, knowing he has won the battle, mockingly orders Daisy to drive back home with Gatsby in Gatsby's flashy yellow car, confident that her affair is over.
On the drive back home, Gatsby's yellow car strikes and instantly kills a woman named Myrtle Wilson, who had rushed out into the dark road. Myrtle was secretly Tom Buchanan’s mistress, and she mistook the yellow car for Tom's. The car speeds away into the night without stopping. When Nick finds Gatsby hiding in the bushes outside Daisy’s house later that night, Gatsby reveals the tragic truth: Daisy was actually the one driving the car because she was too nervous, but Gatsby promises to take the full blame to protect her from the police.
The next morning, Tom Buchanan maliciously protects himself by telling Myrtle's grieving, vengeful husband, George Wilson, that the yellow car belonged to Gatsby and that Gatsby was the driver who killed his wife. Consumed by blind rage and grief, George sneaks into Gatsby’s mansion. He finds Gatsby floating peacefully on a mattress in his swimming pool, looking up at the sky, waiting for a phone call from Daisy that will never come. George shoots Gatsby dead, before turning the gun on himself.
The story ends in deep tragedy. Despite hundreds of elite people attending Gatsby's wild parties all summer, absolutely no one comes to his funeral except Nick and Gatsby’s elderly father. Daisy and Tom Buchanan casually pack their expensive bags, leave the city, and disappear, showing no remorse. Nick, disgusted by the coldness and corruption of the ultra-wealthy elite, leaves New York, reflecting on Gatsby’s tragic life—a man who spent his entire life chasing a beautiful, impossible dream, moving forward like a boat pushing against the current.