It's the '90s, and five losers run an illegal business at their high school. They sell homework and assignments to their classmates. The advantage is that no one ever suspects the nerds. Their business brings them money and popularity. But hormones and an unexpected death threaten to ruin everything. If the business collapses, their futures and their friendships are at risk.

Faced with the imminent death of his father, the town postman, Oscar returns to Mexico for the first time and finds that he is now the only man among the handful of women who inhabit this small place where telephones and internet never reached. While trying to return to the United States, he takes charge of the mail and thus learns the stories and wishes of the inhabitants, including a child who asks about his father's letters. Oscar writes him the long-awaited letters and begins to bond with him and with Martha, his mother. When he can finally leave, he no longer wants to and will have to decide between going back or staying and rebuilding his life.