It′s Friday morning, a day of the full moon, and 12 ten-year-olds disappear on their way to school. The kidnappers leave no clue and make no contact with the police or the parents. Inspector Anatol Water, in charge of this bizarre case, tries to keep the press at bay. But the media soon gets a hold of the situation and now the public gets involved. Finally, the parents receive letters from the culprits and they must decode the enigmatic message to save their children. The catch is, they have only 18 days, or until the next full moon to act.