Q&A USA

감독: Jaume Collet-Serra

주연: Liam Neeson/Vera Farmiga/Patrick Wilson/Jonathan Banks/Sam Neill

전직경찰인 마이클이 보험회사에서 권고사직을 받은날 매일 통근하던 기차에서 한 여인으로부터 제안을 받으면서 기차안에서 의문의 가방은 소지한 증인을 찾아가면서 벌어지는 story.

Michael MacCauley, an Irish-American NYPD member turned insurance agent, has a wife and teenaged son. He goes through the same routine train commute to work and back every day, taking the Hudson Line from Tarrytown to Grand Central Terminal, often interacting with the same other commuters. His daily routine is interrupted when he is abruptly fired from his job after a decade at the same company, leading him to wonder how he will pay his mortgage or afford his son's college tuition. Choosing not to immediately reveal his dismissal to his family, he instead confides in Murphy, his ex-partner on the force, while he and Murphy's unit are at a bar.

On the train home, Michael meets a mysterious woman named Joanna, who makes small talk with him. Joanna describes herself as an academic who studies human behavior and tells him there are 16 distinct types of personalities. She proposes a hypothetical situation to Michael, asking him to do one little thing that he is uniquely skilled for, the results of which would have consequences that he would know nothing about, but would affect one of the passengers on the train. Joanna's one little thing that she wants Michael to do is locate "Prynne," the alias of an unknown passenger, who she says doesn't belong and has something stolen. Joanna proceeds to tell him that he will find $25,000 in the bathroom and will be paid another $75,000 when the job is done. Michael starts to question whether this is real or hypothetical, and Joanna, before she gets off the train, alludes to him being a former cop. Out of curiosity, Michael searches the bathroom and finds an envelope with $25,000.

He attempts to leave the train but is stopped by a young woman who hands him another envelope with Michael's wife's wedding ring, and tells him it's a warning. Michael attempts to call his wife but with no response. Michael attempts to warn a fellow passenger of what is going on by writing on his newspaper. Michael leaves a voicemail describing the situation to Murphy, and then receives a call from Joanna, threatening him and his family. She tells him to look outside, where he sees the passenger to whom he gave the newspaper being deliberately pushed in front of a bus. Joanna then points him to a GPS tracker in his jacket and instructs him to plant it on Prynne.

Michael gives a fake report of suspicious behavior to a conductor, who announces he plans to search a woman's bag. A man immediately leaves the car and Michael follows him, at which point he attacks Michael. They fight and Michael plants the GPS tracker on him. Murphy calls back and informs him that Prynne is a key witness in a supposed suicide case of a man at the city planner's office, Enrique Mendez, leading Michael to realize that Prynne will be killed and that Michael is being set up.

In a deserted carriage, Michael discovers the body of the man he planted the GPS tracker on and a badge revealing he was an FBI agent. He is then contacted by Joanna and chastised for marking the wrong person, before warning him that another passenger has reported his suspicious activities on the train to police, who stop the train to investigate. Michael manages to evade detection by hiding with the corpse under the carriage, but in the process accidentally tears his bag and loses the 25,000 dollars. Sabotaging the air conditioning in the train except for the last car, Michael forces all of the remaining passengers into the last carriage. He realizes another passenger, a Jazz musician named Oliver, killed the FBI agent. Oliver reveals that he also received the same deal for $100,000, but with orders to assassinate Prynne, after Michael has identified him/her. Michael and Oliver brutally battle against and batter each other. Eventually, the hitman is thrown by Michael out of the window of the train and killed. The real "Prynne" is revealed to be a young girl named Sofia, who is holding incriminating information on powerful people and was to go into witness protection at the final stop of the train. Michael asks Sofia why she did not go to the police. She reveals that it was the police who killed Enrique, who was Sofia's cousin.

Joanna calls Michael and tries to convince him to kill Sofia for the sake of his family, but Michael refuses. Joanna activates the fail-safe plan and derails the train in order to kill everyone aboard. Michael manages to save all of the passengers by unhooking the final carriage from the rest of the train right before a curve, but a conductor dies assisting him. Michael instructs the passengers to block visibility into the car by pasting wet newspaper on all the windows, before a massive police force arrives at the scene.

Assuming Michael is holding the train hostage, Murphy is sent to talk to him, only to be revealed as the rogue cop who killed Enrique when he uses a phrase about "being noble" - the same type of language Sofia heard from one of the cops that killed Enrique. Michael and Murphy engage in a fight, during which Michael removes Murphy's electronic ID tag, which identifies him as a "friendly" to the snipers outside using thermal vision. After a violent fight, the snipers, believing Murphy to be Michael, shoot and kill Murphy.

Outside of the train, Sofia is met by the FBI and proceeds to tell them what she knows. Michael is hailed as a hero and exonerated by the other passengers while his family is rescued by the FBI. His old captain admits that Murphy and a few others had been under investigation for some time and offers Michael his job back. Michael rummages in his coat pocket and reveals that he kept the hard drive Sofia gave him containing the incriminating evidence.

Sometime later, Joanna is on a train back from Chicago. Michael approaches her (presumably having found her through the information on the hard disk) and confronts Joanna about her actions before he shows his police detective badge, implying he is ready to arrest her.