Carla Pérez trabaja como empleada en una oficina de correos. Sus padres la han inscrito en la lotería de las visas para obtener una residencia norteamericana, pero ella no tiene ninguna esperanza. Un día, un café se derrama accidentalmente sobre una carta y Carla descubre una manera anónima de ayudar a los demás.
In Havana, a post office branch is more than a place of bureaucratic rules and regulations to ensure effective public services. This is where Carla Perez works. A young dreamer, this government employee transforms boredom into a 'crossroads of feeling in writing'. More than merely sending and receiving letters, she aims to help her companions in finding happiness and love. Such good will can not go un-rewarded. Her exiled parents in Miami entered her name in the yearly U.S. immigration lottery. Unexpectedly, she receives a notice for her interview to get the 'green card'. Now she will have to opt between a future of her own in Cuba, and a future planned by others in Miami.