The book tells the story of Elizabeth, Jennifer, William, and Robert, four friends who saw their playing routine change when a strange and sinister family moved to an abandoned house on the corner of the square and the street of the cemetery. The children s parents banned the approach to the mansion because of the dangers it could present. Beggars lived there, as well as animals like rats, spiders, and scorpions. The mysterious couple had two children, Vladimir, and Norma. Various events and coincidences led the children to believe that it was a family of vampires. Although scared, they set out to demonstrate this, and the story unfolds into adventure, suspense, and mystery, until it all clears up in a surprising ending.