Los vampiros de Transilvania (Cazamisterios de leyendas, 3)

Ulises, Nora, and Bruno are The Mystery Hunters: three siblings who are experts at solving cases. When they receive an envelope with a letter from Transylvania, a new investigation begins! Clue 1. According to experts (or the internet), vampires come from Transylvania. Clue 2. Daniel, the letter's author, claims that a vampire has kidnapped his sister! Clue 3. The number of bats in Transylvania is suspicious… But would that mean… vampires exist?! Luckily, this time they have a new member on the team to help them solve the mystery of this incredible legend: you!