District of Columbia schools secretary Barbara Dreher was last seen by her daughter on Aug. 12, 1984.

The 39-year-old Dreher dropped off two of her young sons at her adult daughter's home in Southeast Washington, then waved goodbye.

Her car was found several weeks later, but Dreher was not.

Nearly 30 years later, the disappearance of the D.C. schools secretary and mother of five remains unsolved, one of nearly 4,000 cold cases in the District of Columbia. Police still hope someone comes forward with information to help with the investigation.

The day she disappeared, Dreher told her children she was going to get some money and would be back shortly. She never returned, and police suspected foul play.

Dreher was not reported missing until nine days later, as she sometimes stayed for long periods of time with her estranged husband in Hillcrest Heights.

Three weeks after she vanished, one of Dreher's children spotted a man driving her 1980 burgundy Oldsmobile Cutlass. Family members trailed the vehicle to a Southwest apartment building.

The family quickly called police. The man denied driving the car and claimed not to know Dreher. Inside the car, officers found a ski mask, rope and gloves, but the man was not charged with a crime.

Dreher was described as a black woman, 5 feet 2 inches tall, 130 pounds, with brown eyes, black hair and a medium complexion.

Anyone with information about this case is asked to call the Metropolitan Police Department's Command Information Center at 202-727-9099. Callers wishing to remain anonymous may call 888-919-CRIME.

D.C. police offer a reward of up to $25,000 to anyone who provides information that leads to the arrest and conviction.