Under the Same Moon (La misma luna) tells the parallel stories of nine-year-old Carlitos and his mother, Rosario. In the hopes of providing a better life for her son, Rosario works illegally in the U.S. while her mother cares for Carlitos back in Mexico. Unexpected circumstances drive both Rosario and Carlitos to embark on their own journeys in a desperate attempt to reunite. Along the way, mother and son face challenges and obstacles but never lose hope that they will one day be together again.

Riggen's film is not only a heartwarming family story; she also offers subtle commentary on the much-debated issue of illegal immigration.