American ex-soldier Ronson (Dolph Lundgren) has fallen on hard times. He has been reduced to brutal illegal prizefights in the dingy backstreets of a city in Inner Mongolia in an attempt to pay off his debts. Things go from bad to worse after Ronson is caught in the act and arrested. The judge offers Ronson a choice: pay off all his debts in a month or return to jail. While Ronson is busy debating his limited options, he encounters the alluring Anika (Yu Nan), whom he follows down an alley only to be attacked by three thugs. After successfully beating off his attackers, he learns that the fight has been an elaborate audition for Anika's stepfather Chambers, a wealthy New York art collector. Chambers offers Ronson enough money to settle all his debts if he will guide an expedition composed of Chambers (William Shriver), Anika, several of Chambers' men and archeologist Ang Shaw into the rugged mountains of Mongolia...

How would you react if three years after the death of your father, you receive a letter signed by him inviting you to visit an abandoned house in the middle of nowhere in China? Curious in nature, you decide to set off on this adventure. Here's the snag, when you arrive in front of the house (which looks more like a bunker), you realize that there are other visitors summoned as well. Four guys show up with the same letter you have! All five characters, Monk, Casino, Black Jack, Shang and Poker have something in common. All carry guns, have dangerous reputations and are wanted by the police. Unexpectedly the door to the house is opened by a mysterious woman and shortly after entering they notice that they are all locked inside. The house is surrounded by police and they can not escape the psychotic killer that wants to wipe them out. After shocking plot twists and with a growing suspicion of each other, they come to realize that they have only one hour to live.