Sam Smith, the diamond Don Carlos

Sam is in the second year of his training as a secret agent and leaves for an internship with the Spanish secret service. His stay is abruptly interrupted when someone places a precious diamond on his doorstep. A legend tells that the diamond belonged to a certain Don Carlos and that it hides a great mystery. However, the police think that Sam has stolen the diamond and Sam flees. But not only the police are pursuing him, two strange societies also want to get their hands on the diamond. Sam no longer knows who he can trust and goes on his own search for the truth ...