Stacey Brown, a junior in Hillcrest High School experiences recurring nightmares. Similar events and similar places keep appearing again. She used to have them in the past, and now she has them again. This time they involve Drea, her closest friend and roommate.

Everything happens just it is in Stacey's dreams. Drea receives lilies whose number represents the number of days she has left before she is going to meet her stalker and die. Drea also receives strange phone calls and emails from Chad. Stacey is determined to resolve these mysteries, find the stalker, and save Drea's life. She has to use her grandmother's Wiccan spells, some of them for the first time in her life.

She knows that Drea's stalking is connected with phone calls from an unknown stranger. At first Drea herself doesn't want to talk about it, embarassed that she let herself get involved in a friendship with someone she doesn't know. She realizes she made a mistake, but it is too late. The stalker starts threatening her and Stacey. It also turns out that another girl, Veronica Leeman is threatened in the same way. Only when she receives a warning to mind her own business along with Drea's handkerchief she decides to avoid any matter involving stalking.

Veronica receives an email from Chad to collect her cheat sheets from the classroom. When she gets there however, she is killed. Stacey finds Veronica lying down dead in the classroom and is questioned by the police. The next day also Drea is missing, but only Stacey seems to be doing something about it. All her friends are preoccupied with their own problems. Stacey tries to contact the spirits to help her track down Drea. She receives further clues but she receives a message that her dreams provided her with enough information already.

Stacey decides to venture into the woods on her own, notifying the police about it. She has to rely on her own instincts only and her grandmother's guidance.

In the woods she meets Donovan who seems to be running from someone. He wants to help her, but ends up convincing her to leave. Stacey becomes suspicious about him. Her mistrust is confirmed as she follows Donovan into the house. He becomes unfriendly towards her. Stacey almost gets away when she realizes that she must find Drea. Her urge to pee is connected with what she has seen in her dreams. Consequently she runs to a porta-john. Drea is inside it. Unfortunately, Donovan's also shows up, threatening both Drea and Stacey. They engage in a fight, but the police turns up just in time. They arrest Donovan.

Following the court case, Donovan is charged with involuntary manslaughter, convincing the jury that his actions were not planned and is sentenced to a detention. Drea returns home for the entire semester. Stacey and Chad can finally spend time together as a couple.