Ruthless People

Here's a rephrased version of the section:

Beverly Hills fashion mogul Sam Stone (Sam) harbors a deep-seated disdain for his wife Barbara, having married her solely for the wealth she brought to the table. His plan to eliminate her and claim her $15 million fortune is foiled when he returns home to find her missing, with only a cryptic message from her abductor demanding a hefty ransom in exchange for her safe return. Unbeknownst to Sam, his mistress Carol has other plans, opting to send their lover Earl to capture evidence of Sam's nefarious intentions. Instead, Earl inadvertently captures a compromising moment between a couple at a cliffside location, mistakenly interpreting the woman's screams as Barbara meeting her demise.

Meanwhile, Barbara finds herself trapped in the basement lair of Ken and Sandy Kessler, a lower-class couple hell-bent on exacting revenge from Sam for pilfering their life savings and fashion designs. Despite their best efforts to intimidate her, Barbara proves a formidable opponent, earning the sympathy of Sandy as she begins to see the error of their ways.

Carol's misguided attempt to incriminate Sam by forwarding a copy of Earl's compromising footage backfires when he assumes it's a birthday present and responds with a lewd message. This misstep prompts Carol and Earl to go into hiding, unaware that their actions have inadvertently set in motion a chain reaction that will ultimately lead to Sam's downfall.

As Barbara begins to transform her physical appearance through television exercise programs, she finds solace in the creative outlets offered by Sandy's fashion designs, which now accommodate her slimmer physique. In contrast, Ken becomes increasingly desperate as he repeatedly lowers his ransom demands, eventually settling on a paltry $10,000, only for Sam to dismissively refuse any concessions.

Meanwhile, Carol's attempt to discredit Sam by sending another compromising tape to the police chief, Henry Benton, backfires when Benton himself is revealed to be the unsuspecting participant. This discovery sets off a chain reaction that ultimately culminates in Sam's arrest following the seizure of chloroform and compromising photographs from his illicit affair with Carol.

As Ken's moral compass begins to reassert itself, he returns home to gather Sandy and make a hasty exit to Mexico, only to discover that his partner has been busy releasing Barbara from her predicament. The two women have formed an unlikely alliance, seeking to monetize Sandy's burgeoning fashion empire. However, their plans are cut short when the notorious Bedroom Killer invades their sanctuary, confronting them alongside Barbara as she reenters the scene. A heated altercation ensues, culminating in the killer's untimely demise after tumbling down the basement stairs.

Seething with resentment and fueled by a newfound sense of purpose, Barbara joins forces with Ken and Sandy to exact revenge on Sam, their treacherous adversary. Together, they concoct a plan to extort his vast fortune, worth an astonishing $2.2 million, in a bid for retribution. Following his release from custody, Sam reluctantly collects the ransom payment, desperate to clear his name and prove his innocence regarding Barbara's disappearance.

Meanwhile, Carol finally views the incriminating tape, only to realize Earl's egregious mistake, prompting her reunion with Sam as they coordinate the ransom handover. However, their plans are foiled when Earl ambushes Sam and a masked Ken at the exchange, leading to a tense standoff that culminates in Earl's arrest.

As the authorities close in, Ken issues a chilling warning: Barbara will meet a deadly fate if they intervene, prompting him to make his escape with a police convoy hot on his heels. Cornered and desperate, Ken takes a perilous leap off the Santa Monica Pier, seemingly succumbing to his watery grave. The police later recover the body of the Bedroom Killer, disguised as Ken, from the car, but remain stumped by the whereabouts of the ransom money.

Despite his apparent demise, Sam is ecstatic that Barbara must be deceased, only for her to reappear on the pier, identifying the killer as her abductor and sending him tumbling into the ocean. In a separate development, Ken emerges from the depths of the sea in scuba gear, clutching the coveted briefcase, and celebrates his triumph alongside Sandy and Barbara.