In Washington D.C., the Secretary Michael Bergstrom talks to his wife and son by cellphone in a park and then commits suicide. In Venice, California, the reclusive hacker Angela Bennett works in home office for the Cathedral Software in San Francisco, and her point of contact is her co-worker Dale. Angela has no relationship with her neighbors and her mother Mrs. Bennett has Alzheimer's disease that she visits in an institution. When Angela is planning to travel on vacation to Cozumel after six years without vacation, she receives from Dale a disk of the Game "Mozart's Ghost" with a "pi" that gives access to the Gatekeeper security system sold by Gregg Microsystems and used by several companies and government. She returns the FedEx with a powerful virus that she has isolated. Dale schedules a meeting with Angela before she travels to Mexico to discuss his findings, but his Cessna crashes on a tower and he dies. Angela travels to Cozumel, where a man named Jack Devlin hits on her and seduces her. He takes Angela to a restaurant and while walking on the beach, a thief robs her purse and Devlin runs after him. The thief was hired by Devlin, and he kills him and takes the disk from her purse. He returns and takes Angela out in his speedboat to kill her, but they have one nightstand. While dressing, Angela finds Devlin's pistol with silencer and fights him. He passes out and she escapes with the disk in a motorized small inflatable boat, but she crashes a rock, and fishermen find and take her to a hospital. Three days later she wakes up and learns that the disk is ruined. Further, all her life has been deleted from the computer system and she has become Ruth Marx. She travels back home with a temporary passport in the name of Ruth Marx and finds that her house is empty and is for sale. She contacts her psychoanalyst Dr. Alan Champion, who has a crush on her and does not believe but helps her. Now Angela Bennet needs to recover her identity and discovers a huge conspiracy using the Gatekeeper to manipulate data of their users. Further, Jack Deviln is hunting her and her few friends down since she saw the backdoor of the Gatekeeper.