An inscription in the concrete floor of a Waikato house referring to missing woman Mona Blades has prompted police to investigate.
The 18-year-old vanished more than 28 years ago while hitchhiking from Hamilton to Hastings.
The inscription was discovered when carpet in the house, in a small Waikato town,was pulled up.
Along with the words "Mona Blades", a cross is also etched into the concrete slab, giving it the appearance of a grave or headstone.
It is understood that tenants in the house were so alarmed by the discovery that they moved out. The owners informed police.
Detective Sergeant Brian Schaab, of Napier, who headed the Teresa Cormack case, is looking into the inscription.
The Blades file is held at the Rotorua police station, where officers are checking to see if the inscription has been investigated before.
Detective Senior Sergeant Garth Bryan, of Rotorua CIB, said information on the Blades case was received about once a month. Possible graves had been investigated in the past.
A truck driver last saw Mona Blades getting into an orange Datsun 1200 station wagon on the Napier-Taupo road on May 31, 1975.
The police inquiry focused on the sighting of the vehicle, resulting in hundreds of orange Datsun owners being interviewed.
The area around a metal side-road of the Napier to Taupo road, where the Datsun was seen turning off, was exhaustively searched by police. New technology at the time, such as infrared heat sensors, were used, and British psychic Doris Stokes lent her help to the search.
However, no trace of her body or any of the belongings she carried were found.
