On August 1, 1974, six-year-old Mylette Anderson and her eleven-year-old sister Lillian Annette Anderson vanished from their Jacksonville, Florida, home. Their mother and an older sister had left the house about 6 p.m. to visit a sick relative. A 7 p.m. phone call between the mother and the girls reportedly sounded normal; by about 7:20 p.m., when the father returned, both children were gone.

Neighbors said a white car had been seen in the driveway. There were no obvious signs of a struggle, but the family dog was found shut in a bedroom and Mylette’s favorite doll was missing. The sisters’ disappearance occurred during a summer that saw five girls go missing from Jacksonville in three months; two of those later were found deceased, but Mylette and Annette’s remains were never recovered.

Serial killer Paul John Knowles later claimed responsibility for deaths of two girls matching the sisters’ descriptions, but investigators did not find physical evidence tying him to this case and his involvement remains uncertain. The case went cold and the parents died without learning what happened to their daughters.

If anyone knew the Anderson family or has information about that evening in 1974, please share what is known.