In the early 20th century, a naive young man named Lucius Priest, who happens to be a distant relative of the McCaslin/Edmonds clan, becomes an unwilling participant in a reckless adventure steered by his family's manservant, Boon Hogganbeck. Without obtaining the necessary approval from Lucius' grandfather, Boon makes off with one of the first automobiles in Yoknapatawpha County, owned by Lucius' illustrious grandfather. On their expedition to Memphis, they unwittingly encounter Ned McCaslin, a black man who works at the stables with Boon, and naïvely invite him to join their escapade—showing just how little they considered the consequences. Intriguingly, Ned turns out to be a blood relative of the Priest family.
Upon their arrival in Memphis, Boon and Lucius settle into a boarding house, where they meet the mysterious madam, Miss Reba, along with her intriguing entourage. The establishment's moral complexities come to light when it becomes evident that Boon has involved an 11-year-old boy in their escapades, leading Corrie, the local favorite, to voice her grave concerns over this unexpected guest. As the night progresses, Corrie's nephew, Otis, shares sordid tales of his aunt’s checkered past, revealing a shocking history of exploitation and prostitution in their small community. Infuriated by Otis' crude storytelling, Lucius confronts him, resulting in a harsh altercation that leaves Lucius with a nasty hand injury inflicted by Otis' pocketknife. In the midst of chaos, Boon steps in to restore peace, while Corrie finds herself inspired by Lucius’ bravery, vowing to leave her life of vice behind.
As the evening unfolds, Ned returns triumphantly, claiming that he has bartered the pilfered car for a supposedly unfit racehorse. Together with Corrie, Reba, and Lucius, they devise a plot to stealthily transport the horse onto a midnight train bound for Parsham, aiming to enter it into a high-stakes race. Ned believes that the townsfolk will underestimate them, giving them the chance to recover their losses by repurchasing the original vehicle. Utilizing her connections, Corrie secures passage for the horse and their crew with the help of her friend, Sam.
Upon reaching Parsham, Ned leaves Lucius with a local black family while they prepare for the much-anticipated race. However, their plans take an unexpected turn when Butch, the corrupt local lawman, discovers their scheme and attempts to extort sexual favors from Corrie in return for his silence. Quick to act, Reba threatens to expose Butch’s misdeeds by revealing his request for not one, but two prostitutes, thereby isolating him from the community. As tensions escalate, the group must navigate treacherous waters to make their dreams a reality.
On race day, as the sun breaks over the horizon, Lucius mounts Coppermine, endearingly referred to as Lightning by Ned. With unwavering resolve, Lucius feigns defeat in the initial round, adhering to their strategy. However, fate intervenes when Butch steps in and arrests Boon for stealing the prized horse. In a moment of solidarity, Lucius teams up with one of Ned's relatives to rescue Lightning from the burgeoning chaos while Corrie distracts Butch with a flirtation, clearing the way. Remarkably, against all odds, Lucius and Lightning emerge as the champions of the race, bewildering the spectators. As they revel in their unexpected victory, Lucius' grandfather, Boss Priest, makes a surprise appearance at the racetrack.
That night, Ned unveils his cunning ulterior motive: Bobo, a distant cousin, found himself in over his head owing a substantial debt and agreed to steal a horse as collateral. Seeing promise in Lightning, reminiscent of a once-sickly mule he'd trained for racing, Ned hatches a plan to pit Lightning against the car. However, Boss Priest's unexpected entrance disrupts Ned's designs. Caught in the midst of the stolen horse scandal, Boss Priest is left with no choice but to enter another race: victory would mean a hefty payout of $500, while defeat would ruefully forfeit the prize without claiming ownership of the horse. Aware of the stakes, Ned intentionally sabotages their chances knowing that Lightning's superiority lies only in its potential.
In the aftermath, Boss Priest steps in again, rescuing Lucius from retaliation by his father, acknowledging that the challenges he faced were punishment enough. Eventually, Boon and Corrie decide to marry, delighting in the inclusion of the name Lucius Priest Hogganbeck for their future child—symbolizing the intertwining legacies of their extraordinary adventures.
