He also wanted to help the reader recognise the extraordinary work done by the counsellors who wean addicts off the drug, the efforts of police in the Far North, and the very real, ongoing threat posed to society by P.
Writing the book had taken on a new, very personal aspect when one of his own family "became involved" in it.
Meth, he said, last week and in 'Pure,' made the user feel all-powerful, unstoppable, complete as a person, as one of his characters says, like a runaway train. The train, he said, was very much running away in the Far North.
And he wasn't offering any sort of quick fix, in the book or at the launch. Then list MP Shane Jones had been quoted in the Northland Age weeks earlier as recalling a warning from Hawaii 20 years ago that the "tsunami from hell" was heading for New Zealand, and it had now arrived.
"The police will never contain it," Chamberlain said.
"It is up to communities to do something. And if this book helps people come to understand the extent of the problem, and the effect it is having on their lives and loved ones, then I will have achieved what I set out to do."
Zac Sullivan certainly "does something," although his response might not be everyone's cup of tea.
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Only four copies of the first print of 'Pure' remained unsold last week, but more were on their way. They will be available at McCarthny Mitre 10 and Rider's Sports Depot in Kaitaia, the Bakerman in Awanui and the Northland Age. Alternatively, go to the publisher (shihvillage.com), email the author (marknelle—chamberlain.com), or go to his website (mochamberlain.com).