To meet her 4-year-old son retained in the United States, the enigmatic Isabel decides to rent her womb to give birth to the baby of Sara and Joaquín, a possessive couple, obsessed with the idea of starting a family. When a complication ruins her plans, Isabel draws on Bruno, a one-hit wonder novelist who has an aversion to fatherhood. This decision will alter the fate of Isabel, Bruno, Sara, and Joaquín irreversibly.