A kindly nurse tries to unlock the secrets of a coma patient's injury - and discovers the bitter rivalry, infidelity, betrayal and murder behind them.
Katherine, a former TV star, wakes up in the hospital after a severe accident that has left her with locked-in syndrome, where she is completely paralyzed and cannot communicate. A nurse named Nicky begins to work with Katherine, to try to help her regain bodily control. Nicky seeks information about Katherine from Lina, the wife of Katherine's deceased step-son, Jamie. In a series of flashbacks, we learn of the events which transpired before the accident.
Katherine's husband was very wealthy and left everything to his son Jamie after his death. Jamie longed for Katherine's love and care, but she was often preoccupied with resentment over her disinheritance.
Lina is the daughter of a childhood friend of Katherine's. Upon the death of Lina's mother, Katherine had taken her in and adopted her. Lina took responsibility for Jamie, becoming his primary caregiver and forming a close bond with him. Lina and Jamie married in adulthood, and Katherine became bitter over Lina's ownership of the family estate by way of marrying Jamie.
Dr. Robert Lawrence, the family doctor, becomes involved in their lives and starts an affair with Lina, who's struggling with the lack of fulfillment and autonomy in her isolated life. However, Robert's ulterior motive is hoping to inherit the property. He prescribes Jamie painkillers which causes his health to deteriorate. Later, Robert persuades Jamie to take a boat ride with him and Lina. On the water, Robert deliberately capsizes the boat, and pulls Jamie deep underwater until he drowns. Lina attempts to rescue him but fails.
Following Jamie's funeral, Robert tries pressuring Lina to sell the mansion so they can live elsewhere. She resists due to her promise to Katherine and realises his true intentions. Robert reveals that he has Lina's journal, in which she had written fantasies about killing Jamie. Robert insinuates that Lina could be blamed for Jamie's death. After a brief struggle, Lina runs home to find Katherine, only to discover that she and Robert have also been having an affair. She decides to leave but is chased out of the house by Robert, along with Katherine. While fleeing, Lina sees Katherine raise a rifle and aim it in her direction.
As Katherine gradually recovers, Nicky teaches her to communicate by responding to letters of the alphabet by blinking. Nicky is shocked when Katherine spells out the word "murder". When Lina learns of this, she persuades Robert to help her take Katherine home, believing that Katherine will implicate them both in Jamie's death.
Nicky follows them and reveals to Lina by text and phone call that Katherine was actually trying to protect her from Robert. In a more detailed flashback from the night of the accident, we see Katherine shoot Robert's tire as he tries to run Lina down, having second thoughts about hurting her. Later, after Katherine begs him to let Lina go, Robert purposefully runs over Katherine with his car.
Lina tricks Robert and injects him with a lethal drug he has prepared for Katherine, but it is not strong enough to kill him. Robert attacks Lina and attempts to kill Katherine with another injection. However, Lina manages to stab Robert to death.
The police later arrive at the mansion and collect Robert's body as Lina, Katherine, and Nicky watch. Lina asks Nicky what she will tell them, but Nicky remains silent. Lina and Katherine hold hands. (thanks to Wikipedia)
