Belgian detective solves this time the murder committed at the Halloween party. During the youth celebration held on the eve of the feast of all saints, someone drowned a thirteen -year -old girl. The famous writer Ariadne Oliver, who accidentally attended, decides to address Hercul Poirot - she does not seem to be a crime committed by a fierce perpetrator in the sense of the meaning. The key to mysterious death is probably in the sentence that the murdered Joyce in the preparation of the party: I saw murder…