A former boyfriend of Alex is in trouble when a prison is released from jail, waiting for a new trial. The crime boss is killing the witnesses that put him in prison in the first place. Walker must save the witness so he can testify again.
An Irish peacemaker visits Texas to talk about a plan to unify Ireland. Irish militants attempt an assassination. One of the militants is captured and the rest of the team attempt a rescue as well as continue the assassination attempts.
When Victor Larue, the one who terrorized Alex is brought to trial. At the trial, he manages to get the bailiff's gun. He then demands that Walker come here but Walker is chasing someone else. So while they wait he and Alex talk about the time he held her captive.
A woman asks Alex to help her escape from her abusive husband. Alex's woman support group goes on a retreat for a few days, and have the women help each other. The husband finds out where they are, placing everyone in danger.
Walker working with the FBI busts an arms dealer. The man in charge pulls a gun and Walker shoots him and his dying words are for him to watch out for his brother. The brother who was out of the country training some mercenaries, upon learning of his brother's death, he takes his mercs and goes to Texas. Upon arriving he uses the FBI agent who worked with Walker to get him. He knocks him out and when Walker wakes up he tells Walker that he's going to have to take on each of his men who have been told to kill him.
Walker wakes up in a hotel room with a gun in his hand and a dead man on the floor. He cannot remember what happened nor who he is. A cocktail waitress from the hotel casino helps him escape the people trying to kill him.
When the Texas State Legislature is pondering budget cuts, Sen. Warren Hughes suggests disbanding the Texas Rangers ... unaware of a deadly plot an experienced jewel thief has planned for his daughter, Lindsey. When the thief hatches his plan and has Lindsey buried alive, it is up to Walker and Trivette to track down Lindsey's captors and where they have buried her before it is too late. In the process, Sen. Hughes learns just how vital the Rangers are to fighting crime.
The Texas Rangers ask the Russians for assistance in capturing a criminal the Russians had previously dealt with. A mild-mannered Russian shows up, pretending to be powerful. When they find the criminal, the Russian gets beaten up.
A family man hard-pressed for money is forced to help with a bank robbery. The robbery goes awry and the man returns to his family. As they prepare to leave town, the son falls into a sink hole. Walker and the others try to help the boy.
CD is inducted into the Ranger Hall of Fame. Meanwhile, the only case CD could not solve when he was a Texas Ranger comes back to haunt him. The Hangman is back to his old tricks. The Hangman taunts CD with calls about his killings.
Trivette's cousin is killed when he learns soldiers are stealing supplies from the base. The killers are part of a white-supremacist group; the leader is arrested for murder. The group retaliates by taking over a TV station for hostages.
The skeletal remains of a teenage Native American boy are found on a construction site. The boy was murdered eight years earlier. Walker feels the spirit of the Native American who helps him solve the mystery of his death.
A group of cops execute criminals that beat the justice system. After a few murders, the Rangers figure out the pattern and try to track down the bad cops. When an innocent person is killed, Walker makes it his job to stop the group.
An agricultural company produces cattle feed that contains a virus. Instead of recalling the feed, they let the virus spread for research and a way to make it better. The virus affects almost everyone in town.
Alex is about to prosecute a man named Karl Mayes. She learns that he hired her father to defend him. Alex's father is a recovering alcoholic and Mayes gets him to drink. Eventually he's not sure if he can defend Mayes. Which makes Mayes wonder if he can trust him to keep quiet.
An investigation into the theft of a state-of-the-art military helicopter for use in the drug trade leads Walker to a former fellow Marine Corps officer, who abandoned his unit 25 years ago in Vietnam.
Walker and Trivette are in the midst of investigating a trio of college students who use the drug rohypnol to subdue unsuspecting female victims in nightclubs, when their friend Darcy Reynolds is raped on her 21st birthday. After another one of their victims is killed, the trio become willing to try anything to shake the Rangers.
Eight years previous, a bank robbery resulted in the sheriff being killed, and the criminals escaping in a small plane. Current day, the plane is found crashed in the mountains. Walker and Alex investigate, riding into the rough country.
Alex, C.D. and a group of fifth- and sixth-grade students from a Dallas-area elementary school are kidnapped by mercenaries, who demand $10 million in ransom. To ensure their demands are met, the crooks trap the victims in the bus and park it in a landfill, then cover it with mud. Walker and Trivette race against the clock to save the students and their friends and capture the criminals - also well aware that a deadly storm system with a history of spawning deadly tornadoes.
Walker's friend Father Blake is besieged by a ruthless developer who plans to build shoddy condominiums on the same site that the priest has announced plans to build a shelter for the homeless. The developer's cronies assault Blake, but a down-on-his-luck veteran and his faithful canine companion, Lucky, witness the crime. "Soldier" goes into hiding, so it is up to Lucky to aid Walker in his search for witness and help derail the developer's crooked plans.
Walker tells children a Christmas story about a Texas Ranger from 1876. Hayes Cooper was said to have no Christmas spirit. In 1876, a baby was kidnapped and Haynes was assigned the case. At last, he found the baby and Christmas spirit.