The murder of Harvey and Jeannette Crewe in their Pukekawa farmhouse in 1970 is one of the nation's most infamous unsolved crimes.
Between two trials, two appeals, several books, a film, and even a Royal Commission finding police corruption- their killer has yet to be identified.
Reporters Kirsty Johnson and James Hollings re-examine the case in their new book 'The Crewe Murders'.
"It's an extraordinary story, as a cold case or a murder mystery, if you'd like. But it's also unusual because it's the only time the Government has ever given a free pardon to a living convicted murderer."
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