The District inspectors are dealing with the disappearance of a young pony express who "ruinously" came into possession of a bag full of cash. The case turns dark when his body is found in the ravine of a park. While her colleagues from the 10th Tuscolano investigate the robbery of an armored van and discover that the driver's death was a case of premeditated murder, Inspector Anna Gori has to deal with Nadja's suspicions, whose distrust of her risks infecting Dorian as well.