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Socially awkward and downtrodden corporate strategist Linda Liddle anticipates a long-promised promotion from Bradley Preston, the son of her former boss, upon his appointment as CEO. Instead, Bradley awards the position to Donovan, a recent hire and former fraternity brother, and plans to sideline Linda in a dead-end role, citing her abrasive manner and lack of charisma.

When Linda confronts him, Bradley is impressed by her boldness and invites her to accompany him, Donovan, and two other executives on a business trip to Bangkok to finalize a company merger. During the flight, Donovan humiliates Linda by playing an audition tape she made for Survivor, highlighting her survival skills. As the plane passes through a storm, it suffers engine failure and rapidly loses altitude. During explosive decompression, Donovan attempts to strangle Linda and take her seat, but she stabs him with a fork. Everyone except Linda and Bradley is sucked from the aircraft before it crashes into the sea and sinks. Linda escapes, swims to the surface, and clings to floating debris.

The next morning, she wakes on a remote island in the Gulf of Thailand and finds Bradley alive but badly injured. With no other survivors, Linda builds shelter and secures food and water. Bradley relies on her but continues to treat her as a subordinate. In response, Linda abandons him for two days. When she returns, he is near collapse from dehydration. Though still resentful, he begins to accept her authority. Linda proves adept at survival, catching fish and killing a wild boar. While exploring the far side of the island, she spots a passing boat. Though tempted, she deliberately avoids signaling it.

As Bradley recovers, Linda teaches him survival skills but warns him to avoid the far side of the island, claiming it is filled with poisonous plants. One night, while drinking homemade fruit wine, she confesses that she was once married to an abusive man and allowed him to drive drunk, leading to his death. Bradley appears sympathetic and offers to cook for her, but secretly poisons her meal with berries before attempting to escape on a makeshift raft. The raft is destroyed by the waves, and Linda, having survived due to his misjudgment of the dosage, rescues him from drowning.

In retaliation, Linda paralyzes Bradley using octopus toxin and pretends to castrate him, asserting control over him and their situation. While harvesting fruit, Linda encounters Bradley's fiancée, Zuri, who arrives by boat after the end of official rescue efforts. Fearing the loss of her new life and purpose, Linda leads Zuri and the boat captain to an unstable cliff, where they fall off. She returns to the camp alone, shaken and withdrawn, allowing Bradley to hunt by himself. While doing so, he discovers Zuri's buried remains.

Confronted, Linda claims the deaths were accidental, but Bradley accuses her of murder and attacks her. In the ensuing fight, Bradley gouges Linda's eye before she stabs him. Bradley escapes and discovers a luxurious beach house on the far side of the island. Linda follows, revealing she had known about the house all along and confessing to causing Zuri and the captain's fatal fall. She threatens Bradley with a shotgun, and he pleads for his life, claiming he loves her and wishes to remain on the island. However, she notices he is concealing a weapon. Bradley seizes the shotgun, but discovers it is unloaded. Linda overpowers and kills him with a golf club.

A year later, Linda has been rescued and reinvented herself as a wealthy and beloved celebrity, capitalizing on public interest in her ordeal as the apparent sole survivor of the crash. At a celebrity golf tournament, she promotes a film adaptation of her best-selling memoir and announces her intention to write a self-help book.