It is also the story of Wingspan, which is celebrating its quarter century, she says.
"There are take-home messages in there too, such as a way you can make a ruru nest box, and give them a habitat and enjoy wildlife while at home."
The majority of the book's photos have been taken by Kurien (Koshy) Yohannan, one of Wingspan's staff.
Debbie decided to write the book because, "it was a story that needed to be told".
She says she is also hoping the book might inspire people to help with conservation.
"This is the first time I've done anything like this. It's been a long process and couldn't have been done without Penguin Random House.
"This pre-launch event is acknowledgement of these people who have made this book possible."
She says about 50 people attended the pre-launch and some were representatives of Ngāti Whakaue, with Wingspan having recently moved onto ancestral land.
The Hunters will be available in leading bookstores and online.
There are 500 limited edition hard-cover books which have been developed as a collector's item and are available through Wingspan.
All proceeds of these editions go towards the development of the new national bird of prey centre.