As the sweltering summer sun shines down on a dusty Texas farm, 14-year-old Walter finds himself dropped off at the doorstep of his great uncles, Hub and Garth, a pair of reclusive bachelors rumored to have amassed a fortune through their daring exploits. The uncles' rundown farmhouse, filled with makeshift traps and shotguns, becomes a target for wandering salespeople, who are often met with a barrage of gunfire from the porch. Initially unwelcome, Walter eventually earns the respect of his uncles when he inadvertently thwarts an attempted scheme by some opportunistic relatives seeking to exploit their wealth.
As Walter begins to adapt to his new life in the attic room, his enthusiasm for adventure slowly wins over Hub and Garth. They reveal themselves to be eccentric millionaires with a treasure trove of stories about their past escapades. To spend some of their riches, they order a lion for hunting, but instead, they end up with a tame lioness from a circus, who becomes Walter's unlikely friend.
Over the summer, Walter gets entwined in the peculiar world of his great uncles. When Hub suffers an accident while handling Lion Chow, requiring a brief hospital visit, Walter realizes just how much these quirky men care for him. One day, while at a roadside diner, Hub's lightning-fast thinking saves the day when four thugs brandish switchblades. Meanwhile, the elderly lioness starts to roam free, marking her territory as her own "jungle" in the cornfield, adding to the chaotic charm.
As the plot thickens, Walter discovers a mysterious photograph of a captivating woman hidden in the attic, leading him to uncover his great uncles' extraordinary past. Exciting tales of their time with the French Foreign Legion surface, including Hub's marriage to an Arab princess named Jasmine and a duel that spared a sheikh's life. Tragically, Jasmine dies during childbirth, bringing Hub back to a quieter life on the Texas farm, steeping him in a sense of longing and nostalgia.
One fateful night, Walter ventures after Garth into a concealed room beneath the barn, unearthing a stash of cash that has attracted unwanted attention. Enter Mae and her latest beau, Stan, who brazenly accuses Hub and Garth of being robbers while demanding to know where the fortune lies. Walter stands firm in his belief of his uncles’ integrity but ends up cornered and beaten by Stan's intimidation. Just when hopelessness begins to creep in, Walter’s fierce protector, the lioness, emerges from the cornfield, confronting Stan with determination to defend her new home.
The following morning, as Walter leaves with his mother, a surprising twist occurs: Stan will be accompanying them to recover from his injuries. As they drive away, Walter's frustration towards Mae bubbles to the surface, leading to a dramatic confrontation where he demands she prioritize his needs, ultimately deciding to abandon her. Back at the farm, Hub and Garth are delighted by Walter’s return, but he insists on significant changes—his uncles must take a more proactive role in his education and embrace a life that defies their impending mortality.
Seventeen years pass, and the local sheriff brings somber news: Hub and Garth have met their fate during a failed stunt in their biplane. Walter arrives back at the farm to find he has inherited everything from his uncles. Yet, just as he starts to process this life-changing news, a helicopter emblazoned with the logo of Western Sahara Petroleum lands, bringing a stranger and his young son. The stranger shares that he grew up hearing tales of Hub and Garth from his grandfather, a wealthy sheikh who was entranced by the adventures of these two American legends. As the man's son seeks confirmation about his uncles’ extraordinary lives, Walter’s reply is clear and unwavering: > "Yeah, they really lived."
