The Secret of the Sagrada Familia

It all started on an ordinary day, when a letter from Antoni Gaudi, the architect of the Sagrada Familia, emerged out of nowhere speaking about a secret that nobody knew. Two children, Roger and his friend David, now try to discover the secret that is hidden in the Holy Family. And they have to hurry, because there are other people who want to discover it first, and these other people carry very bad intentions…