DEBORAH GONZALEZ HENDERSON works as a member of the security detail for US Senator EDWARD JOHNSON, whom she accompanies on frequent travels to Canada to meet with executives of Superb Metals Inc, a company that owns a mine in Mexico. Superb Metals supplies chromium to US gun companies for weapons manufacturing. After SENATOR JOHNSON and several of his colleagues oppose gun control bills in the Senate, DEBORAH suspects they are accepting bribes in return for their influence in Congress. When her son JASON is killed by a deranged shooter at the grocery store and SENATOR JOHNSON opposes new gun control legislation, DEBORAH decides to tell a reporter what she knows about SENATOR JOHNSON'S dealings with Superb Metals and US gun manufacturers. Before she can do so, she is kidnapped and held hostage at Superb Metals' mining compound in Mexico. While there, she learns her close friend and former colleague, CHRISTOPHER COLLINS, another member of SENATOR JOHNSON'S security detail, has been killed.
DEBORAH manages to escape from the mine and is rescued by members of Las Zetas cartel, former owners of the mine who are actively fighting to regain control of it from Superb Metals. At a high-end dance club in Chihuahua city several nights later, she uses her military training to kill intruders and save members of Las Zetas, who own the club. Las Zetas' leader RAUL VAZQUEZ offers her a reward and she asks for his help in gaining proof to convict the corrupt Congressmen, which could eventually result in the mine being returned to the cartel. RAUL agrees to finance her undercover investigation and provide personnel to help her. She is also aided by GREG, an American computer specialist she meets in Chihuahua city who gives her high-tech video recording equipment in the form of a necklace.
In disguise, DEBORAH returns to the US and obtains information about who is responsible for the payments to offshore banking accounts for SENATOR JOHNSON and his colleagues. She then travels to Canada to interrogate HARRY TREMBLAY, the bank vice president who set up the accounts. With a little stimulation from DEBORAH, TREMBLAY willingly provides the account information and the names of the gun manufacturers paying the bribes. Back in Mexico, DEBORAH gives the information to Las Zetas' leader RAUL, who sets up a meeting between Las Zetas and Superb Metals with the intent of regaining control of the mine. RAUL asks DEBORAH to be a member of the negotiation team. DEBORAH also gives the information to her new friend GREG, who sends it to the FBI. GREG reveals to DEBORAH that he is really her former friend and colleague CHRISTOPHER and an undercover FBI agent. The two make love and begin to plan a future together.
On the way to the negotiations meeting between Las Zetas and Superb Metals Inc, DEBORAH learns that SENATOR JOHNSON has framed her for the death of HARRY TREMBLAY, the Canadian bank vice president. She fears for her life. SENATOR JOHNSON attends the negotiation meeting as a member of the Superb Metals' team. DEBORAH recognizes him, but he doesn't recognize her. The negotiations don't go well and DEBORAH reveals her identity to SENATOR JOHNSON and tells him she has enough information to send him to jail. He threatens her and the FBI steps in to arrest him. Gunfire breaks out between Las Zetas' and Superb Metals' protective forces as DEBORAH tries to flee. Many deaths occur on both sides.
At SENATOR JOHNSON'S trial for accepting bribes, CHRISTOPHER COLLINS (aka GREG) provides evidence DEBORAH procured on the necklace he gave her of payments to SENATOR JOHNSON from Superb Metals and US gun manufacturers. He also testifies that he fears DEBORAH is dead, because her bodyguards were killed at the negotiation meeting and no one has seen or heard from her since. SENATOR JOHNSON is convicted and taken into custody. Later, CHRISTOPHER receives a mysterious letter that reveals DEBORAH'S fate and his future.