The book follows Ruben, a down-on-his-luck guy who gets swept up in a conspiracy when he finds a mysterious letter that leads him to a hidden treasure. He joins forces with two other unlikely characters, and together they face danger and intrigue as they try to claim the fortune.
The twist at the end reveals that Ruben's lineage connects him to the powerful Medici family, making him the rightful heir to their vast wealth.
However, it's important to note that the ending is ambiguous. While Ruben discovers his heritage, the book doesn't explicitly reveal how he'll use this newfound knowledge or whether he will actually claim his inheritance. This leaves the reader with the question of what Ruben's future holds.