The day she vanished Ms Chen, who was born in China but made Auckland her home after studying there, drove to her work as normal. She spent the day doing her usual duties and was, according to workmates, her usual self.
Just before 5pm she left the office, got into her silver Toyota and drove to her home in Waiau St, Torbay.
Her partner, Jack Liu, reported her missing at 9.30pm that night, saying she had left the house to go walking at 5.30pm and had not returned.
Exhaustive searches yielded no clues about what had happened. It was Guy Fawkes night and the streets around the route she normally walked were busy. Yet no one has said they saw her.
Seven months on, there has been little movement in the case. There has been no arrest and Ms Chen's body has not been recovered.
Mr Scott believes she is buried in a green area - a park or reserve near her home. And he says sightings of a white 2002 Nissan Pulsar station wagon may hold the key to finding her.
Since February police have been seeking sightings of the car in the Torbay, Albany and Rosedale areas on and around the night of November 5. It may have been in an unusual location; it may have been driven erratically.
Mr Scott said sightings of the vehicle were crucial.
"Any information people have is very important to the investigation. If people saw the car, we certainly want to hear from them."
Mr Liu was in regular contact with the investigation team. He usually went walking with Ms Chen but on the night she vanished, he had stayed home with a leg injury.
Can you help?
Did you see Cissy Chen on the night of November 5? Did you see a white 2002 Nissan Pulsar station wagon in the Torbay, Albany or Rosedale areas, parked in an odd spot or being driven erratically? Have you noticed any strange smells in parks or reserves in the area that police need to know about? Or do you have information on who killed Cissy? Contact the investigation team on 0800 CISSY (0800 24779) or Crimestoppers anonymously on 0800 555 111.
