Ginés Martín works in the thanatopraxy department of Forensic Anatomy. Single and with no living relations, he only allows himself to remember Susana every 7th of November. On that date he carries out a small ritual in remembrance of his friend who died ten years before. The previous 7th of November Ginés had received an email, signed with the the mathematical symbol for infinity, that not only seemed to understand of the importance of Susana in his life but invited him to participate in a game whose rules he does not know. Ginés remembers having seen that symbol tattooed on the bodies of two suicide victims and realises that the action takes place on the streets of the city. He and former inspector Elena Márquez find themselves embroiled in the madness of a being who appears before them, all too powerful, intelligent and unreachable. A spiral of events that for them has only one objective: to stop Infinity's destructive work.