Episode 4 of "Under a Dark Sun" dawns with Leo awakening in the confines of a captor's car trunk, the dim light revealing a peculiar tattoo etched on the nape of their neck—a fleeting clue in an otherwise shroud of mystery surrounding his abductor's identity.
Meanwhile, at the opulent estate, preparations are in full swing for a grand gala, meticulously orchestrated to court Maison Oris and cinch the deal. Mathieu's son frowns in dejected silence, his birthday overshadowed by his father's oversight amidst the festive buzz. The other attendees grapple with their own predicaments, casting a pall over the impending revelry.
Lucie finds herself in the company of an enigmatic woman who believes they possess sufficient leverage to "intervene," their conversation laced with an air of intrigue. Elsewhere, Beatrice reluctantly indulges in Jacques' bizarre rituals, presenting him with a dainty dress for the impending bash, her compliance a mask hiding her true sentiments.
Alba, still reeling from Leo's abduction, is mandated to attend the party regardless of her tumultuous emotions. In a hushed conversation with Valentin, they ponder if the perpetrator behind their surveillance might also be behind Leo's disappearance. Her turmoil escalates as she receives another chilling message, commanding her to eliminate Jacques within the hour.
Yet, Alba's distress is mirrored by Mathieu, whose relentless consumption of cocaine and alcohol fuels his desperate push to finalize the deal. Omar's discovery of Jacques' proposals and plans for the plantation sends shockwaves through the evening's meticulously laid plans.
Beatrice too, is far from pleased, confronting Jacques about his unauthorized intentions to sell the estate to property developers. Her astute observation of his body language reveals his duplicity, and she refuses to play along any longer. However, Jacques holds the ace up his sleeve—her gambling addiction, which he threatens to expose, leaving her in a precarious position.
At the gathering, Manon finds herself mingling amidst the revelers, her attention drawn to Mathieu's son, whose demeanor reflects a deep-seated turmoil. She attempts to offer him solace in the form of a book, only to be met with a sharp rebuke and a defiant refusal.
Elsewhere, Alba grapples with an internal conflict of monumental proportions as she schemes to eliminate Jacques. Her moral dilemma is further complicated by the unwelcome presence of a detective, probing into the affairs of the evening with probing questions. With Thierry lying comatose in a hospital bed, Alba fabricates a tale, informing the detective that Leo slumbers peacefully at home, omitting any mention of the abduction or the ominous messages.
When Mathieu ascends the podium to deliver his oratory masterpiece, his surprise at seeing Alba among the attendees throws him off balance. His erratic behavior, a telltale sign of his ongoing drug addliction, ensures that his speech falls flat. In a swift maneuver, Jacques seizes the moment, publicly announcing his engagement to Beatrice, eliciting polite applause but lacking the genuine warmth of heartfelt congratulations.
Valentin and Alba, now privy to the assailant's motive for targeting Jacques, conspire to craft a lethal potion. Their clandestine activity in the study, blending pills into a beverage, is interrupted by Beatrice, who discovers them and promptly ejects them from her presence. She then hands over the poisoned drink to Jacques, oblivious to Alba's silent resolve. Alba, having retrieved a gun from her vehicle – the very weapon meant for the deed – prepares to pull the trigger, only to witness Jacques's sudden collapse as reality dawns upon her.
Post the tragic event, Alba receives the coordinates to Leo's location and dashes off without delay. As she speeds away, the family convenes, with Beatrice succumbing to a drugged drink, likely administered by Lucie, given her earlier hints at "intervening."
In a desperate rush, Valentin and Alba hurry towards the van where Leo and Noor are held captive. Just as they locate their loved ones, a shocking revelation unfolds: Valentin turns the tables, holding Alba at gunpoint, leaving them both at an impasse amidst the unfolding chaos.
