Wife of convicted double murderer John Barlow, Angela Barlow, says the couple have written a book to present evidence about the case.
The London-based Privy Council -- the final court of appeal -- rejected Barlow's last appeal yesterday.
The Wellington businessman was sentenced to 14 years' jail for murdering Wellington father and son Eugene and Gene Thomas in 1994.
"[The book] will be an honest account about what happened, putting [forward] our case and the crown case and all the evidence and the Privy Council," Mrs Barlow told Radio New Zealand today.
She said the book was "coming out soon -- I hope".
"We thought they were the highest court in the land and they would see what the case was all about, but obviously they've got a lower standard than courts in the [United] States," she said.
"They are just believing what the Crown says."
She vowed to continue the fight to clear her husband's name, though had yet to speak to him about what move they would make next.
Barlow would finish his jail term as a convicted double murderer rather than an innocent man, after his appeal was rejected.
The five law lords who heard Barlow's appeal said last night that while he had an arguable case, on the evidence he was properly convicted by the jury.
"The Board accordingly concludes ... that, while the introduction of the misleading evidence ... was indeed a miscarriage, no substantial miscarriage of justice actually occurred," the judgment said.
Though flawed evidence was used in his trial, the board found the "circumstantial case against Mr Barlow ... overwhelming".
"While all the points made on behalf of the Crown were significant, their Lordships are particularly struck by certain very obvious aspects of the circumstantial case against Mr Barlow."
After twice going through trials that ended in hung juries, Barlow was convicted in 1995.
The appeal, by his lawyer Greg King hinged on faulty evidence given by FBI agent Charles Peters about tests on bullets thought to have been used in the murder.
Mr King told the law lords during the February appeal, that crucial evidence relating to the weapon and bullets that killed the men had been falsely linked to Barlow, a former antiques dealer, who is serving his time in Upper Hutt's Rimutaka Prison.
The FBI tests have since been discredited worldwide for providing a high number of false matches.
The Privy Council judgment pointed to evidence that Barlow was in the room about the same time the murders were committed; and the day after the murders, Barlow threw away his gun at the rubbish tip.
They also said before disposing of the gun, Barlow had substituted another barrel for the original barrel.
Lastly, the law lords said Barlow had given three "contradictory and inconsistent accounts of his conduct" to the police and another person.
"These are merely four very broad aspects of the circumstantial evidence which stand out," the judgment said.
Mr King would not comment on the Privy Council's verdict last night. He told NZPA he would make a comment after reading the full court ruling.
Barlow was denied parole in April, after his November hearing was adjourned to allow for further psychological testing.
The board said that testing indicated he would still pose a risk to the community.
"We are not prepared to take the risk of releasing him at this time," the board's decision read.
However, it did support reintegrative leave for Barlow, saying he was clearly in the reintegrative phase of his sentence.
Mrs Barlow told The Dominion Post her husband would be "heart-broken".
"But he won't be surprised because the whole judicial system has kicked us in the guts right from the start. I don't know who is pulling the string here but it's a shocking decision."
Mrs Barlow believed her husband would be freed in March because he "ticked all the boxes".
