In Phoenix, Arizona, Orderly Zack Walker is helping his fiancée and nurse Maria wheel in a patient with a head wound. A Secret Service agent tells them that he's put a guard on the doo and they're to notify the man if the patient, Tom Fisk, says anything. As they discuss their engagement and her brother's upcoming bachelor party, Zack suddenly blacks out. He finds himself in a cheap hotel room with his car keys on the desk. There's also a newspaper which reveals that he's in Portland, Oregon, and two days have passed since he can remember. On the bed is a duffle bag with a cell phone and a plastic gun.
Zack talks to the front desk clerk, who confirms that she checked him in. He then calls Maria, who doesn't understand and thinks he's trying to get out of their engagement. Zack finds his car outside in the night, throws away the gun, and starts to drive away… and suddenly discovers that it's daylight and he's driving down a country road. He manages to pull over in time and discovers the plastic gun is in the back seat. He throws it away again and finds a sign saying he's 43 miles out of Seattle.
Zack blacks out again and awakens to find himself in a Chinese restaurant buying a lacquered case from Mei Ling and her father, a black marketer. Thugs search Zack and take $5,000 from him, which Mei Ling says is the agreed-upon price for what's in the case. Zack takes the case and confirms that it contains another plastic gun, designed to get through security metal detectors. He leaves and discovers that he's in Seattle, and his ATM account is empty. The police drive by and briefly take an interested in them, but Zack puts them off and gets in his car.
Zack blacks out again and finds himself taking a shower in an expensive hotel room. A newscast on the television is talking about how the President's daughter, Michelle Carson, is visiting Seattle. On the wall is a map of the building with exits, entrances, and security routes marked. The plastic gun is on the desk and someone has written "Don't fight this" on the mirror. Zack calls Maria, who grows increasingly concerned as Zack tries to convince her something is wrong. She suggests that Zack turn himself over to the Secret Service. He sets up a meeting with agent Carl Taggart in the hotel's ballroom and tries to explain what he's been going through. Taggart thinks he's a nut until Zack tells him to have men check out his hotel room. When Taggart gets word of what's in there, he tries to arrest Zack.
Zack blacks out again and finds himself standing over an injured Taggart.
Zack blacks out again and finds himself walking down a hotel corridor. He's carrying the plastic gun and someone has written "12:45" on his hand. Zack looks at a clock and discovers its 12:44.
Zack blacks out again and finds himself at the top of an escalator. Michelle Carson is riding the escalator up toward Zack. He takes out the gun, aims, and fires... at a bellhop. Taggart arrives and takes Zack prisoner, but he explains that he's Tom Fisk, Taggart's partner, and that the man he shot was an assassin who shot and injured Fisk in Phoenix.
Zack blacks out one final time and finds himself back in Phoenix... in Tom Fisk's body. He tries to tell Maria what happened as she backs away in horror.