Two stories are narrated in parallel. The first one happens in 1390, in a Jewish quarter, where some kids stumble upon a secret society that still exists nowadays. A great mystery that takes us back to that difficult period for the Jewish people. All the characters existed in their time period, and every narrated fact occurred in reality. The second story stars a group of friends in the present day that must solve a centennial-old mystery.

Without a doubt, the highlight of the series is their female main characters, the historian Rebecca Mercader and her mysterious friend Carlota Penella, whose fame has surpassed the novel series itself. It isn’t strange because they are among the most Intelligent women in Europe.

The reader changes the story every 4-5 pages. Different characters and tales are separated from each other by more than six hundred years. It looks like two novels in one. The reader starts asking himself, why am I reading two stories that have no connections? The simple answer is that you will figure it out if you keep reading. Maybe they have more connections than you think, and nothing is what it seems.