By Audrey Young
But Mr Lange's widow, Margaret Pope, says her husband never trusted Mr Hensley because of his views on Anzus and she is sceptical about how he will be portrayed in his book.
"David inherited him from [former Prime Minister Rob] Muldoon and he did not trust him and he wanted him to go but Gerald would never take the hint," she told the Herald.
"The reason why he didn't trust him wasn't anything to do with Gerald personally but because he was so much of the world view that said we had to be in Anzus, no matter what."
The old nuclear wounds are being re-opened with the publication of Friendly Fire, by Mr Hensley, on how the nuclear policy led to the collapse of the Anzus pact.
Mr Hensley was then head of the Prime Minister's Department and worked closely alongside Mr Lange and the United States over the first proposed US ship visit after the 1984 election.