A possible concise summary is:
Two girls, Penélope and Luana, are preparing for Penélope's Halloween party, which is exclusive and only for the coolest people in the condominium. They meet a new girl, Tati, who seems friendly and interested in Halloween. They invite her to join them in asking for sweets and going to the party. However, Tati turns out to be the cousin of Raica, a strange girl who was run over last year on Halloween after being humiliated by Penélope and Luana. Tati and Raica planned to get revenge on them by scaring them with a killer clown costume and inviting everyone else to a bigger party at their grandmother's house. Penélope and Luana are left alone and angry, while Tati and Raica enjoy their Halloween.
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