Elena Álvarez is thirty years old, one of the most gifted neurosurgeons in the building, and quietly disappearing. By day, she is precision itself - the surgeon residents study, the hands a dying patient is lucky to get. By night, she is somewhere else entirely: a bottle she tells herself she controls, a relationship that costs her more than it gives, a craving she has spent a decade learning to hide in plain sight. Then someone she loves ends up on her operating table, and the distance between Elena's two lives collapses in a single afternoon. What follows is not a redemption story. It is an account of what addiction actually costs - not just the person using, but everyone standing close enough to keep loving them anyway. A found family built from neighbors, porch lights, and Sunday dinners who refuse to let her go, even when she gives them every reason to. Entropy is a novel about the gap between competence and collapse, about institutions that protect brilliance until brilliance becomes a liability, and about the unglamorous work of staying. Book One of The Horizon Series.