In Moscow, Russia, Viktor Chagarin (Sergei Kolesnikov), a high-ranking but corrupt Russian official, plans on incriminating him as a political prisioner, former billionaire and government member Yuri Komarov without a fair trial when Komarov refuses to hand over a secret file believed to have convicting evidence against Chagarin. In a separate incident, Jack McClane is arrested as a result of an assassination but agrees to testify against Komarov for a shorter sentence.
John McClane, who has not been in touch with his son for years, learns of Jack's situation and travels to Russia to help. When McClane arrives and approaches the courthouse that holds Jack and Komarov on trial, an explosion orchestrated by Chagarin and his henchmen occurs in the courthouse, and Jack breaks free with Komarov. Seeing his son, McClane confronts him, but their dispute is cut short when the henchmen, led by Alik (Radivoje Bukvić), chase them on the streets of Moscow. McClane, Jack, and Komarov escape.
Hiding in a safe house, McClane finds out that Jack has been a CIA officer in an undercover operation for the past three years. Collins, Jack's partner, demands the file's location from Komarov so that the CIA can bring Chagarin down, but Collins is soon shot by Chagarin's men and dies, as McClane, Jack, and Komarov survive subsequent heavy gunfire and escape again. The trio then make their way to a hotel in the city to find the key to a vault containing the file. There, they meet Komarov's daughter, Irina, whom they earlier planned on joining with, but McClane grows suspicious of her, which is proven correct when Alik and his men crash in and tie McClane and Jack up, while Komarov is taken as a hostage, and Irina confesses to snitching on them for the "millions of dollars" to be gained. Jack breaks free of his ties, and the two succeed in killing most of the men. Alik and the rest of the henchmen come back on a helicopter and try to kill them, but the two manage to escape.
That night, the two steal a car full of firearms and drive to Chernobyl, Ukraine
, the location of the vault that houses the file. When they arrive, they find that Komarov, Irina, and Alik have already arrived, but what they don't know is that on their way there, it was revealed that there was never a file in existence, and that the drawer with the file inside was actually the secret passage to a vault containing a large amount of weapons-grade uranium. Komarov kills Alik and calls Chagarin to tell him that he and Irina had manipulated the entire sequence of events since the beginning in an attempt to obtain the uranium and get revenge on Chagarin. Chagarin is then killed by a subordinate of Komarov.
At this point, McClane and Jack enter the vault, discover Komarov's true plot, and capture him. Irina, with another henchman, comes to her father's aid, but before they can escape, Jack goes after Komarov, while McClane goes after Irina, who is escaping on a Mil Mi-26 helicopter. Irina tries to protect her father by firing the helicopter's cannons at Jack, but McClane is able to bring the helicopter out of balance by driving a truck in the hangar section, still shackled by a chain, out of the open rear ramp of the helicopter. Komarov remarks that Jack will get to watch his father die, which enrages Jack to hurl him off the rooftop into the path of the spinning helicopter's rotors, killing him. McClane is thrown off the helicopter and reunites with Jack on the building. Wanting to avenge her father, Irina rams the helicopter into the building in a suicide attack, but both father and son survive by leaping off the building and into a large pool of water as the helicopter crashes and explodes, killing Irina.
Having mended their relationship, McClane and Jack return to New York, reuniting with Lucy, McClane's oldest child and Jack's sister.
in my opinion it was a good film, but they should have released it on father's day