The film is adapted from the famous novel "The Three Little Detectives," which tells the story of three young detectives who travel to Transylvania to follow in the footsteps of Count Dracula. They live in a coastal town called Rocky Beach, located between Los Angeles and Santa Barbara. This summer, they have the opportunity to intern with Peter's father on the set of a new Dracula movie. However, as soon as the three young detectives arrive, they hear strange knocking sounds, eerie melodies that keep repeating, and encounter a grumpy caretaker along with his creepy dog. Is Piatra Castle haunted? Or is there a scientific explanation behind these strange occurrences? Faced with these mysteries, Peter, Bob, and Justus have found their new case. The three detectives take us on their investigative journey into a world filled with ancient legends, superstitions, and hidden treasures. These mysteries involve a long-missing boy, a mysterious brotherhood, and a sinister spirit...