A New Hampshire deputy constable named Clendon Macmillan comes to Laredo with 9 years of experience, intending to improve the quality of the average Ranger. He would like to apply his modern law enforcement techniques to what he refers to as "" the most primitive law enforcement organization in the country - the Texas Rangers."" He is sent out with Reese, Chad, and Joe to track Running Antelope and Linda Little Trees. Chad and Joe take a fiendish delight enjoying the fact that no man has ever rubbed Reese the wrong way as easily as MacMillan does. They arrive at a town just raided by Running Antelope and find Linda Little Trees in jail. While the rest are having steaks with the Marshall Little Trees talks MacMillan into releasing her, saying she will take him to their hideout. He is taken prisoner and rescued by Reese, Chad and Joe. Upon their return to Laredo Parmalee offers MacMillan the toughest Ranger assignment ever but MacMillan declines saying he's needed back in New Hampsh

Reese's friend Cletus Grogan comes to town and Reese gets him to join the Rangers to convince him he isn't a jinx. Cletus is sent along with Reese, Chad and Joe to track down Linda Little Trees and her gang. Cletus ends up dislocating Chad's shoulder. The first town they arrive in has just had it's bank robbed by the Little Trees Gang. Chad sees a doctor for his shoulder while Joe immediately follows the outlaws trail before a rainstorm can wipe out the tracks. After the rain stops Joe takes off his wet shirt and is spotted by Linda Little Trees who is smitten with him. He is jumped by her gang and fights them off until Linda hits him on the head with a rock. Linda proposes to a tied-up Joe while Blue Dog, who wants Little Trees, threatens to kill him. Reese, Chad and Joe find the hideout and capture everyone but Linda Little Trees. Reese tricks Cletus into fighting by pretending to be wounded. Cletus overcomes is jinx fear, resigns from the Rangers and heads home to marry hi

Reese comes up with the perfect plan to catch Linda Littletrees, use Joe, who she is in love with, as bait. Parmalee says they might use the plan but then orders Reese, Chad and Joe to stay off the ""streets"". Reese and Joe are walking down an ""alley"" when they run into three escaping prisoners, two of Littletrees gang and William Tinney, a Ranger from Company A posing as an outlaw to gain the confidence of Littletree's gang. Reese captures Tinney and Joe tracks the two escaped outlaws Max Vander and Blue Dog. Reese is sent to San Antonio to fill in for Tinney, who is to continue his undercover role. The Captain and Chad spend their time waiting and worrying about Joe's safety. Joe is captured by Littletrees gang and locked in a room where she serenades him and has a wedding suit laid out for him. Tinney arrives as Joe is trying to escape and they capture the gang, including Linda who, to Joe's relief, tells him she won't love him anymore if he takes her to jail.

Captain Parmalee receives an invitation to the reading of Jake Ringo's will, a man he arrested who has been hanged. Parmalee will be the only law officer amongst a who's who of criminals that includes Linda Littletrees. Chad and Joe, who Linda has feelings for, are to accompany Parmalee but Chad convinces Erik that Linda is like Pocahontas and he takes Joe's place. The meeting place is the Halfway Mansion which has the America-Mexico Border line running right down the middle of the house. The will states that the money gets split evenly among everyone, as long as they are alive. Since this is a group that already hates each other Captain Parmalee, Chad and Eric have their hands full as they try to stay alive, arrest those they can and return the $75,000.