Carmen and Elena Iturrioz are sisters and partners in a laboratory inherited from their parents. Both carry out the cases that reach the laboratory, together with a team of collaborators. Each episode will stage a new story that arrives at the laboratory at the hands of characters seeking to find out their identity, recognize a son or a brother, gain access to an inheritance or identify a genetic disease, among others. they will reveal who they are; they will get closer to their own personal and family identity.

Itatí lives with his family in a town surrounded by the river. The domestic and daily order of their lives changes when she begins to feel a wild impulse that leads her to go on nocturnal escapades. Itatí experiences an animal transformation that no one in the town understands. She will have to decide whether to continue accepting social mandates or transform definitively.