Casanova- Barcelona's Escape

The survival of our organization, The Rombo Code, hangs in the balance…. Our oldest member and leader, Mr Rombo, keeper of our organization's most valuable secrets, has suspiciously disappeared. The last we know is that he was investigating the life of Giacomo Casanova. It is known that during his stay in Barcelona in 1768, Casanova had an affair with the wife of the Captain General of the army, which is why he spent 42 days in the prison located in Montjuic Castle. Three centuries have passed until a stubborn history professor, an expert in the mysteries of 18th century Europe, became interested in the matter and decided to conduct a more exhaustive investigation. That man is actually Mr Rombo, and we suspect that his disappearance is related to the investigation... However, not everything is bad news, before being arrested, Mr. Rombo created a complex encryption system so that only other members of The Rombo Code can find them. We know that someone has called the police who, by our calculations, will be at the office in 60 minutes. Your mission is to discover what has happened. And Mr Rhombus? Don't worry, if you have any chance to help him, the answer is behind those walls.