After hesitantly going back to her tourist-heavy hometown of Roswell, New Mexico, the daughter of undocumented immigrants uncovers a startling revelation about her high school crush, now a police officer: he is an alien who has concealed his otherworldly powers throughout his life. She safeguards his secret as they rekindle their relationship and start to explore his origins. However, when a brutal attack and an enduring government conspiracy suggest a larger alien existence on Earth, the climate of fear and animosity jeopardizes his anonymity and their growing love.