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Ethan Morgan (Matthew Knight) is a geeky freshman, not trusted by his parents to stay home alone with his little sister Jane. They hire Erica (Kate Todd), a girl from Ethan's high school, as a babysitter. However, Erica comes across her best friend Sarah (Vanessa Morgan), and Jesse (Joe Dinicol), Sarah's vampire ex-boyfriend, on the night she is to babysit, and decides to attend a party that Jesse is throwing instead. During a fight between Sarah and Jesse, Sarah lands in the bushes of Ethan's house and tells Ethan's parents that she was asked to babysit instead. Benny, Ethan's dorky best friend, soon arrives. Without knowing why, Ethan has a vision when touching Sarah, and notices she has no reflection in the mirror, leaving him suspicious of her.
Sarah leaves to get Erica back from the party, knowing the party is full of bloodthirsty vampires. Curious, the boys have Benny's grandmother watch over Jane while they follow Sarah. They see her feed on a rat and realize she is a vampire. Sarah quickly explains that she is only a fledgling (a vampire who has not drunk human blood) and was turned into a vampire by Jesse. The three of them return home, where they are attacked by a vampire servant of Jesse's. The vampire is subdued by Sarah and they head to the vampire party to save Erica and Ethan and Benny's dimwitted friend, Rory. During this time, Erica is bitten by Gord, Jesse's right-hand vampire. Ethan, Benny and Rory land in a trap, surrounded by Jesse and the other vampires. Sarah is urged to drink Rory's blood but Erica proceeds to bite him instead. Ethan, Benny, and Sarah battle the vampires and escape.
The next day, Rory, now a full vampire after he was made to drink human blood, informs Ethan and Benny that Jesse's gang are going to a Gafer-Lounge. Ethan and Benny follow them with Sarah on their heels. As they watch the vampires dig in the cemetery, Ethan has a vision in which he sees a gravestone. The dates on the gravestone unscramble to the number 219. He also sees a mysterious box, which is then uncovered by the vampires. The box is called the Cubile Animus or "Nest of Souls." Ethan and Sarah figure out Jesse's full plan from an old Whitechapel book, learning that in the original settlement of the town, there was a priest named Reverend Horace Black that led an evil vampire cult. The townspeople burned the members of the cult, leading to all "219" of their deaths. In another vision, Ethan sees that Jesse is, in fact, Horace Black, and plans to use the box on a lunar eclipse to trap the souls of teens going to see a movie premiere to resurrect the souls of his ancient cult.
While the three are on their way to stop Jesse, Benny's grandmother, who explains that she is an Earth Priestess, gives them enchanted daggers and a spellbook to defeat the vampires. She also explains why Ethan sees visions: he is a Seer, which enables him to see visions through touch, and his powers are surfacing now because he is going through puberty. She also explains that Benny is a spellmaster, allowing him to cast spells.
At the theater, the vampires begin to steal the souls of all the teens there, but are thwarted by Ethan, Sarah, and Benny, who manage to destroy almost every vampire. Jesse escapes and Ethan and Benny follow in pursuit. Ethan has another vision and sees the tree he saw inside the book, realizing it's the tree in his backyard, where they find Jesse. As the eclipse begins, Jesse attempts to resurrect the souls from the Cubile Animus, but Sarah tries to hold him off. When the Cubile Animus lands in Ethan's hands, he releases the vengeful souls of the teens that were captured, and Jesse is destroyed. The next day, Ethan, Benny and Sarah head off to school, meeting Erica and Rory, who have decided to live peacefully as vampires.