Mariana cleans a games studio every night. She and her precocious young daughter live in a cramped apartment, takes care of her disabled father, and has no future prospects. She does have a unique skill: performing complex mathematical computations in her head which is observed by a game designer who encourages her to learn computer science at the local community college and then apply for a junior level position at his company. Initially reluctant, suspicious and faced with family crises, Mariana ultimately succeeds.