Walker, trabajando con el FBI, arresta a un traficante de armas. El hombre a cargo saca una pistola y Walker le dispara, y sus últimas palabras mientras muere son que tenga cuidado con su hermano. El hermano, que estaba fuera del país entrenando a algunos mercenarios, al enterarse de la muerte de su hermano, toma a sus mercenarios y se dirige a Texas. Al llegar, utiliza al agente del FBI que trabajó con Walker para atraparlo. Lo golpea y cuando Walker se despierta, le dice que tendrá que enfrentarse a cada uno de sus hombres a quienes se les ha ordenado matarlo.

A crime lord named Caleb Hooks, whom Walker helped put in prison several years ago, escapes from prison, hell bent on revenge against the Texas Rangers (because Hooks' brother had been shot and killed during a shootout, and he claims it was murder). Hooks initiates his plan by having Alex and Trivette kidnapped, then placed in a huge tank full of freezing, running water. Hooks then contacts Walker and begins playing cryptic games with Walker, in hopes of both luring his sworn enemy into a death trap of his own and stalling Walker in his efforts to rescue his friends before they drown.