Napier couple Simon and Cathy Cowan hold on to slim hope of finding the truth about their son's disappearance.
Mr and Mrs Cowan have twice in the past two years visited former murder accused Danny Condren, said by police to have been owed $47,000 by Philip Cowan, who disappeared on a trip to Wellington in March 2001.
Mr Cowan says the visit was not what any person might do, but it highlights the desperation of people who have lost loved ones whose bodies have never been found, a situation some other Hawkes Bay families face.
Homicide is suspected or at least considered a possibility in the disappearances of teenager Mona Blades while hitchhiking home to Hawkes Bay in 1971, schoolgirl Kirsa Jensen while horse riding at Awatoto in 1983, Mohaka man Joseph Tuhi in 1994, Napier karaoke regular Richard Woods in 1996, and Napier mother-of-five Annabel Tumanako in 2007.
Mr Cowan says that like he and his wife, there would be other families unable to comprehend how people with the crucial knowledge could do nothing to at least ease some of their grief.