The story explores real-world concepts like telomeres and resveratrol, framing longevity as a rare mutation rather than a supernatural curse.

The family is fractured by how they handle the "efímeros" (short-lived humans). While Iago and his father, Héctor, live in cautious isolation to avoid the pain of loss, siblings Jairo and Kyra are driven to desperation, obsessed with identifying their genetic mutation so they can finally raise children who won't die before them. Scientific Realism vs. Myth

In , Eva García Sáenz de Urturi deconstructs immortality, presenting it not as a superheroic gift, but as a heavy, biological inheritance that isolates the individual from the natural rhythm of humanity. The Weight of Unending Time

Unlike traditional paranormal fiction, the novel grounds its premise in :

By placing the characters in the Museo de Arqueología de Cantabria (MUPAC), the author turns the museum into a metaphorical home. The characters aren't just studying history; they are the history they curate, living out the very eras—Prehistoric, Celtic, Scythian—that they now protect in display cases. The Catalyst of Mortality

Iago del Castillo, at 10,300 years old, suffers from memory overload. His brain must periodically "delete" centuries of information to make room for new knowledge, making his identity a fragmented, ever-shifting mosaic.

The "longevos" (long-lived) are defined by their capacity to stop aging around 30. However, this physical stasis masks a profound psychological toll: