Movie: The Covenant (2006)

Tagline: Only the power of hell can help them.
Trivia: According to the DVD commentary, the filming of the beach party took place in December. The original location was flooded shortly before the scene was shot, and the scene had to be rescheduled at a new location at the last minute. The location that ended up in the film was a sand quarry.
Goofs: Errors made by characters (possibly deliberate errors by the filmmakers): When the doctor is talking about what is wrong with Kate, he says “It’s like she was bitten by hundreds of insects, like spiders.” Spiders aren’t insects and a medical doctor should know that.
“To the students of the Spenser Academy, the Sons of Ipswich are the baddest boys on campus. But that’s not all they share. The four friends also share a 300-year-old secret: they’re warlocks, the teenage descendants of a 17th-century coven of witches. So when the long-banished fifth son suddenly appears and threatens to kill their loved ones, they realize they must face their enemy in order to prevent him from stealing their powers and shattering the covenant forever. Written by Anonymous”