Sylvia Helen Carlson, 39, disappeared from Santa Monica, California on December 12, 1977. She was last seen driving a brown two-door 1977 Ford Thunderbird; that car was found abandoned on January 4, 1978, parked on Penmar Avenue in Venice. Witnesses said the vehicle had been at that location since mid-December.

Sylvia is described as 5 feet 6 inches, about 130 pounds, with blonde hair and blue eyes. Distinctive marks include scars on her back and side and a surgically repaired fracture in her left wrist with a pin. On the day she vanished she was wearing a red dress, a maroon sweater, brown sandals, and possibly several silver rings. Apart from the car, no significant clues were reported and no suspects have been publicly identified.

Her case is classified as endangered missing and remains unsolved. Does anyone have information about Sylvia, her car, or the Venice and Santa Monica area in December 1977 that could help investigators?