A dark tragedy has fallen upon the quiet town of Feria, leaving sisters Eva and Sofía reeling, their understanding of their parents irrevocably shaken.

In pursuit of information about her missing mother, Sofía finds herself drawn into an unfamiliar realm. A shift occurs within the community of Feria; the townsfolk begin to view the sisters with growing suspicion and hostility.

Guillén finds himself increasingly perplexed by the circumstances of Father Ezcaray's death. Meanwhile, Sofía becomes more deeply immersed in her adopted existence. And Eva’s interview takes an unexpected and unsettling turn toward the unca…

In 1975, Elena wrestled with a future dictated by ritual and expectation, a path her father envisioned for her. The following decade, the nineties, brought a new set of trials to navigate.

Driven by a desire to understand the Cult of Light, Estrella delves into the study of Gnosticism, and in her research, makes a significant discovery. Meanwhile, Chisco voices his worries regarding Sofía to Eva.

A hidden message reached the sisters, prompting a secret rendezvous. There, Sofía faced a pivotal decision: to align herself with the cult or with Eva.

A persistent frustration colors Guillén's interviews with the cult's members, each conversation a fruitless search for understanding. Meanwhile, Pablo speaks openly and frankly with his daughters.

The Cult of Light and its infernal forces are relentlessly striving to compel Sofía to unlock the fifth seal. Meanwhile, Guillén experiences a sudden, profound insight.