It’s Christmas night in the Southern California town of Santa Ana. While families pack up gifts and clear messy dinner tables, an older brother and his sister sight-see the festive neighborhood. Their world’s turned upside down by the arrival of alien spaceships. Neighbors and family members are corralled by invaders, leaving it to Gracie and her brother to aid their captured community.Harry, an air conditioning repairman, and his son Frank have journeyed to a fishing bungalow on the Rio Mayo, fulfilling a prior promise Harry made to his son. Frank has returned to Arizona from Chicago where he worked at a Naval hospital during World War Two. Their early-morning encounter with a Mayo Indian brings the father and son into conflict when Frank refuses to believe the man's story. Will they resolve their differences or remain at odds?