Chicago Police Lieutenant Danny Roman is a top
hostage negotiator for the east precinct. His partner, Nate Roenick, warns him that an informant inside the department suspects members of their own unit have
embezzled millions from the police disability fund. Before they can meet again, Nate is shot dead, and Danny is lured to the scene and discovered by the police, but is unable to corroborate Nate's story or identify the informant. Danny is targeted by
Internal Affairs Inspector Terence Niebaum, whom Nate's informant believed was involved in the embezzlement. The gun is recovered from a pond and linked to one of Danny's cases, and a search of his home produces evidence of an incriminating
offshore bank account, making him the prime suspect in the embezzlement and Nate's murder. Forced to surrender his duty piece and badge, ostracized by his colleagues, and with charges against him pending, Danny storms into Niebaum's office for a confrontation. When the investigatior refuses to coooperate, Danny takes Niebaum, his administrative assistant Maggie, Danny's commander and friend Grant Frost, and
con man Rudy Timmons as hostages. With the building evacuated and placed under siege by his own unit and the
FBI, Danny will only speak to fellow negotiator Lieutenant Chris Sabian of the west precinct. He also issues his demands: the return of his badge, a department funeral if killed, and the identities of Nate's informant and killer. Chris, who sees tactical action as a last resort, clashes with Danny's unit, particularly chief Allen Travis and commander Adam Beck. A breach of Niebaum's office backfires when a
SWAT marksman refuses to shoot Danny, who captures officers Scott and Markus. Chris takes command of the scene, but Danny seemingly executes Scott to reestablish control. Danny releases Frost to Chris in exchange for restoring the building's electricity, allowing him to search the files of Niebaum's computer, discovering that Internal Affairs had
wiretap recordings of Nate. Believing Niebaum gave fabricated information when he claimed of not having any connections to Nate while he was investigating the fund, Danny lashes out and slaps him in the face. With the help of Rudy and Maggie, Danny discovers the embezzlement scheme: Corrupt officers submitted false disability claims that were processed by an unknown insider on the disability fund's board. Chris claims to have located the informant in an attempt to end the standoff, but Danny realizes he is bluffing when Niebaum's files reveal that Nate himself was the informant. When Danny threatens to expose Niebaum to
sniper fire in his office window, Niebaum admits that Nate gave him wiretaps implicating three of his squadmates in the scheme; Allen, Hellman and Argento. Niebaum was
bribed by the guilty officers to cover up their crimes, while Nate refused and was killed afterwards. Niebaum has safely hidden the wiretaps, but the corrupt officers enter through the air vents and open fire, killing Niebaum in the process. Danny fends them off with
flashbangs taken from the captured officers, and Niebaum's murder convinces the remaining hostages that Danny is being set up. The FBI assume jurisdiction over the operation, cease negotiations, relieving Chris of command and ordering a full breach as Danny prepares for his eventual arrest, Maggie tells him that Niebaum likely kept Nate's wiretaps at home, while Chris reenters the building to warn Danny, who reveals that Scott is unharmed. Chris agrees to help Danny clear his name, and as the building is raided and the hostages are rescued, Danny disguises himself in Scott's uniform and escapes. He and Chris are unable to locate the wiretaps at Niebaum's home, where the corrupt officers are about to kill Danny, but Frost arrives to negotiate with him alone. Chris shoots Danny, offering to destroy Roenick's evidence in exchange for a cut of the embezzled funds. Frost agrees, effectively revealing himself as the ringleader of the conspiracy, the insider on the disability fund's board, and Nate's killer. Crushing the
floppy disks Chris gives him and shooting Niebaum's computer, Frost exits the house. Outside, Frost discovers that Chris deliberately wounded Danny, who broadcasts Frost's entire confession to the awaiting police officers with a radio. Humiliated, Frost attempts to commit suicide, but is shot in the shoulder by Beck and arrested with the other corrupt officers, and Danny narrowly refrains from shooting Frost to avenge Nate. As Danny is loaded into an ambulance with his wife Karen, Chris returns his badge to him and departs. ==Cast==