The film opens at a dinner party for Gary Graham as Giovanni and his wife Elvira, who are celebrating their wedding anniversary. A blunt intruder interrupts the celebration: Elvira’s father, a senator-like figure, Joe Condon storms in to confront Giovanni about arrogance, adultery, and recklessness. Giovanni remains unfazed, calmly telling his father-in-law to die as soon as possible. Elvira suggests Giovanni leave and fetch champagne from the cellar. Seizing the moment, Giovanni also has a sexual encounter with his wife’s sister. The father-in-law witnesses the act and attempts to kill him with an axe, but Giovanni overpowers him and slays his foe. With the threat disposed of, Giovanni shouts into the night that he is his own king, master, faith, and god.
On a desert highway, the story follows Giovanni as he rides, a camera mounted on the front of his motorcycle pointing toward the endless sea. A mysterious black Cadillac—driven by no one in sight—stalks him, its presence unsettling and perpetual. Along the way, Giovanni picks up a beautiful waitress named Sylvia Kristel who is headed to a nearby town for work, a chance meeting that quickly heats up as their paths entwine. The ride becomes a moving stage for his restless charm, and soon he finds himself drawn toward other desires as he and Julie drift together.
They stop at an isolated body of water where Julie swims while Giovanni looks for more thrill. He then pursues a beautiful farm girl named Charlotte Teresa Gilmore, after he chases off her immature and cowardly fiancé, Pedro Sean Stanek. The pursuit shifts gears as the black Cadillac lingers behind them, a silent challenger in the pursuit of freedom and danger. Giovanni and Julie press on, the car never far behind, widening the sense that danger trails their every move.
The next morning brings a ramshackle bar and a new chorus of trouble. Elvira’s brothers, Charles and Alphonse, are on Giovanni’s trail; the family feud intensifies as Charles Jack Zavorak reappears, while Alphonse’s fate teeters on a knife’s edge. A gang of biker thugs threatens Alphonse, but Giovanni suddenly appears to rescue him, and together they disable the entire gang. Alphonse breathes a sigh of relief, and Charles reluctantly allows Giovanni to slip away, continuing his pursuit toward the coast.
That night, Giovanni nearly seduces Julie again, their chemistry crackling as they are chased half-naked up a tree by the relentless black Cadillac. The car eventually retreats, and the two spend the night in the tree’s shelter, a fragile moment of uneasy closeness amid the chase.
The road resumes its harsh rhythm the next day. Giovanni is bitten by a snake, and Julie tries to summon help at a nearby gas station. In a scene that defies ordinary logic, Julie pleads with the mute garage workers for aid, only to be confronted by three men who begin washing her with sponges. The sheriff arrives and claims the men aren’t dangerous, only that they miss their younger sister. With the sheriff’s help, Julie and Giovanni reach a hospital, where his struggle against death is depicted through a surreal blend of flashbacks and odd imagery.
As they move onward, a homeless man blocks their way in the desert. Giovanni offers a hefty sum if the man will swear there is no god, a moment that underscores Giovanni’s mercurial approach to belief and power. The man declines, yet Giovanni still gives him the money, testing faith and fortune against a world that seems hungry for meaning.
That night, Giovanni and Julie meet a happy couple at a small desert inn and extend an invitation to drinks, which leads to a seduction of the bride-to-be in front of choreographed dancers in a bar. A brawl erupts with the fiancé, and Giovanni and the woman consummate their affair in the desert, a rocky act of defiance amid the landscape’s emptiness.
A new demand arrives in the morning: a man wants Giovanni to repay a loan. Giovanni deftly steers the conversation away from debt, shifting to talk about his own sense of transformation and the appearance of a changed man following god, moments that fuel a mounting tension with Julie. The two argue about hypocrisy, duplicity, and Giovanni’s persistent drive to live a life that seems self-authored and false, and she ultimately departs.
Drunk and clearly unsettled, Giovanni places his head under the wheel of the black Cadillac that has trailed him for so long and falls into a restless sleep. Elvira’s brothers, Charles and Alphonse, step from the darkness to offer one last chance at redemption and reunion with their sister; Giovanni declines, insisting they will have their face-off tomorrow. Before any confrontation can unfold, Giovanni and Julie find one more moment of intimacy, and she finally agrees to be with him.
The chase resumes with the Cadillac and Giovanni racing toward a near-collision with a tractor-trailer. The scene leaves Giovanni presumed dead, his motorcycle crushed beneath the truck and emergency crews swarming the scene. Yet in the final shot, Giovanni rises from the shadowy wake of the pursuing car, stepping in front of a church wearing priestly attire and flashing a devious smile, a shocking rebirth that seals the film’s unsettling arc.
