Halloween approaches and how every year the Mayor of Blossom Creek invited the whole country to a great party in the villa of him. Emily can't wait to wear the new costume of her from Sherlock Holmes! During the party, however, something goes wrong. A shot echoes in the dark, and the playful atmosphere gives way to a survey by murder, which will put the young detective to try more than ever. Among the secrets of the past, a hidden luguber and complicated relationships, Emily will learn to listen not only the formidable intuition of her but also the heart of her.