Con artist and fixer Teddy Murretto is on the run in a stolen unmarked police car, which breaks down not far from a Nevada casino. In the midst of a brawl outside the casino, Murretto sucker-punches rookie police officer Valerie Young so that she will jail him and protect him from his pursuers. One of those pursuers, hitman Bob Viddick, gets himself incarcerated in the same small-town jail by pretending to be drunk and crashing a car into the police car Murretto had abandoned, which was being investigated by two state troopers.Murretto and Viddick are placed in separate cells, initially thwarting Viddick's plan to kill Murretto. However, Viddick has planted a small incendiary device at the station's entrance and when it ignites and the fire alarm goes off, he takes advantage of the confusion. Viddick beats a drunken man sharing his cell and incapacitates the police sergeant, stealing his gun. He is about to kill Murretto when Young interrupts him and returns him to his cell.While Murretto and Viddick trade threats, a new killer enters the police station-Anthony Lamb, a second hitman hired to kill Murretto. Entering the station with a bouquet of balloons as cover, he quickly murders several police officers. Young discovers the carnage and retreats behind bulletproof glass to the holding cells containing Murretto and Viddick. In a hail of bullets, one of Young's own rounds ricochets and hits her in the abdomen. Corrupt police officer Huber, who has been stealing drugs from the evidence locker and has killed the sergeant during Lamb's shooting spree, reveals his betrayal to Young and joins forces with Lamb as they attempt to break through the wall of the holding cells. Murretto explains that he was working for a Nevada casino mob boss and tried to buy off the state's attorney general William Fenton. When Fenton didn't cooperate and was brutally killed, it turned out he had recorded his conversations with Murretto. To save his own skin Murretto agreed to work with the FBI, which lead the mob boss to send hired killers after him.Murretto and Viddick appeal to Young for the keys to their cells. Murretto manages to convince Young to hand him the keys, to the dismay of Viddick. Young releases him to go after Huber and Lamb. Just as two of Young's fellow officers are shot by Lamb after they catch him and Huber trying to break through the wall, Murretto arrives on the scene and attacks Lamb and Huber. In a steam-filled shower room Lamb shoots Huber by mistake while himself being stalked by Murretto. Meanwhile Viddick shows up (having finally convinced Young to release him too), stabs Lamb and offers Murretto the chance to kill Lamb and avenge the death of his ex and son. Murretto instead shoots both Viddick and Lamb, then pours gasoline all over the room, intending to light the entire station on fire and leave the scene, revealing his true nature.Just as Murretto is about to leave he is confronted by Young, who has meanwhile attended to her gunshot wound. She threatens to put him back in his cell, but Murretto lights the place on fire. Young engages in an intense gunfight with Murretto and is finally about to shoot him, when another corrupt cop (Detective Deena Schier, the investigating officer on the Fenton case) arrives and shoots her instead. Deena is promptly shot by Viddick, who leads Young to safety outside and then escapes in a police car.While being taken away by ambulance, Young gets a radio dispatch about a stolen police vehicle from the station. She leaves the paramedics by the wayside, hijacks the ambulance and drives off in pursuit of Viddick, with both singing the same song