Recently divorced Meg Altman (Jodie Foster) and her 11-year-old daughter Sarah (Kirsten Stewart) have just moved into a four-story brownstone located on the upper west side of New York City. Sarah has a medical condition, as she is diabetic. This house, renovated in 1994, boasts all the expected modern amenities, including a quaint yard and an impressive amount of living space that is quite rare for Manhattan, encompassing a lot size of 21 feet by 53 feet which permits for a lovely garden. An intriguing feature of the house is its working elevator, a practical addition for moving between the levels.
The previous owner of the property, a reclusive millionaire named Sidney Pearlstine, designed a secure room specifically intended to protect inhabitants from potential intruders. However, Sidney has recently passed away, leading to a family feud as his children are fighting over control of the estate, with allegations of missing funds complicating the matter. The so-called "panic room," secured on all sides with steel and concrete, features a thick steel door, a comprehensive security system complete with surveillance cameras, a public address system, and a separate phone line to ensure the highest levels of security. Interestingly, Meg suffers from claustrophobia, making the installation of this safety feature more of a challenge for her.
Once Meg makes an offer, she and Sarah quickly settle into their new home. On the first night of their move, around 1:30 AM, their peace is shattered when the house is broken into by Junior ([Jared Leto]), the grandson of the house's late owner; Burnham ([Forest Whitaker]), a worker from the security company, and Raoul ([Dwight Yoakam]), a gunman enlisted by Junior. They are all in search of $3 million in bearer bonds hidden away in the panic room. Junior, seeking to keep the money to himself after the estate is settled, rallied to gain access to the house, mistakenly believing it was unoccupied.
As Meg and Sarah realize their perilous situation, they hastily retreat into the panic room and secure the door, only to discover that the telephone isn't operational. To force them out, Burnham introduces propane gas into the air vents, leading to a tense standoff between the intruders. A chaotic sequence unfolds as Meg, in a desperate attempt to protect Sarah, ignites the gas, resulting in an explosion that injures Junior, temporarily giving them a respite.
Throughout their harrowing ordeal, Meg tries to signal for help, even attempting to make a critical phone call to her ex-husband Stephen ([Patrick Bauchau])—however, the intruders cut the line just as she relays their dire situation. Ultimately, tensions escalate when Junior reveals the existence of more money than initially disclosed, but he is fatally shot by Raoul, leading the remaining intruders to keep Stephen hostage while they continue their plans.
In a twist of fate, Sarah begins to suffer a seizure due to her diabetes, prompting Meg to navigate a maze of danger to obtain the necessary medication stored outside the panic room. Meg uses all her resolve to protect her daughter, even as she engages in a struggle with Raoul, ultimately managing to retrieve the syringe to stabilize Sarah.
As the police respond to the situation, Raoul threatens to harm Sarah. Meg, driven by the need to protect her child, deceives the officers to keep them from entering. A showdown ensues, culminating in a moment of moral contention as Burnham, who has shown reluctance to hurt Meg or Sarah, ultimately ends up assisting in giving Sarah her injection.
After a series of dramatic confrontations, including a heart-stopping rescue, the situation finally resolves with the police apprehending Burnham. As the dust settles, Meg and Sarah, having endured a nightmare, start to consider their options, searching the newspaper for a new, smaller home as they begin the process of healing and moving on from their traumatic experience. It is a story of resilience, survival, and the indomitable bond between a mother and daughter amid chaos.
