This remake of a recent Swedish thriller basically combines The Sixth Sense with "The O.C." In it, an apparently dead teen (Justin Chatwin, War of the Worlds) wanders the halls of his high school looking for help in nailing his killer. He finds it in the form of a depressed girl (Margarita Levieva), who is suffering her own slightly more symbolic form of "invisibility." Can Ghost Boy and Gloomy Girl put things right before, you know, some other bad stuff happens? 97 minutes PG-13.