The poisoning of four thoroughbred horses, including one of incalculable value, causes profound shock at the tranquil La Galana estate. This tragic event triggers an investigation by SEPRONA (the Spanish Civil Guard's Nature Protection Service) that uncovers a web of family secrets, rivalries, and hidden passions that will affect everyone in the marquisate.
Following the mystery of the poisoned horses, Lieutenant Alicia Hermida continues to unravel the secrets of the Acuña family in La Galana. Meanwhile, Alicia and Miranda grow closer as the investigation becomes more complicated with the discovery of a body, which opens up new leads and raises suspicions within the clan.
Alicia Hermida makes progress in the investigation into the deaths of the horses at La Galana with a key interrogation of Fernando Vázquez's nephew. Meanwhile, Fernando faces a new conflict when he discovers the relationship between his daughter Camino and Héctor Acuña, the son of his greatest enemies.
The Civil Guard has begun investigating a new crime at La Galana, the estate of the Marquesses of Monteclaro, where they were already investigating the unsolved deaths of four horses. The Acuña del Monte family is worried about this latest crime on their property, while Lieutenant Alicia Hermida and her colleagues are involved in the investigation.
Lieutenant Alicia Hermida and Captain Elías Cano begin working together to uncover the origin of the crimes committed in La Galana. Meanwhile, the investigation continues by the journalist from 'La Gaceta de La Vega', who wants to publish everything that happened at the Monteclaro estate in the local newspaper.
The discovery in the well marks a turning point in the investigation and forces Captain Elías Cano and Lieutenant Alicia Hermida to rethink the case. They inform the Acuña del Monte family and the gamekeeper, Consuelo, who is deeply affected by the news.
A new tragedy strikes La Galana, and the Acuña del Monte family must rebuild their lives as suspicions begin to surface among them. Tension also erupts at the Civil Guard barracks, where Lieutenant Alicia Hermida is determined to solve the case of the poisoned horses.
Héctor Acuña accepts the harsh truth Consuelo revealed to him about his daughter Carmen. Miranda confronts Alicia, and her relationship with Jacobo falls apart when she uncovers his lies: Yago saw him giving money to a farm worker and found a woman's hair accessory in his car. Furthermore, Jacobo is summoned to testify before the Civil Guard and clashes with Lieutenant Hermida.
