Brandi Jondell Summers was 5 when she was taken from her family home in San Bernardino, California, on March 30, 1977. That day her mother, Beverly Wise, was found stabbed to death. Brandi and her 2-year-old half-sister, Tiffani Wise, were abducted; an 8-month-old sister was left behind unharmed.

Witnesses described a man who resembled Brandi’s father, Roy Summers, and one witness saw a man place Tiffani into a gold Camaro. Roy had a history of violence and unstable relationships, was arrested in 1979, and some of the girls’ belongings were found in his possession, but neither Brandi nor Tiffani was located. Over time there were unconfirmed sightings of Roy and the girls in Idaho, Utah, and Nevada. Juanita Iwakiri was convicted in 1980 of aiding the abduction of Tiffani, though that conviction was later overturned.

Brandi had cystic fibrosis and needed medication, a detail that makes her disappearance especially urgent. The case remains unsolved. If anyone knew the family, saw the girls, or has information about their possible movements after March 30, 1977, please share what you know.