In this final, bonus podcast, join Helen Clark, Jim Bolger, Dame Jenny Shipley and Sir Geoffrey Palmer in conversation with Tim Watkin and Guyon Espiner, as we launch the book of the series, The 9th Floor.

Four Prime Ministers on one stage. It was an historic line-up and the reason why more than 400 people crammed into the marae at Te Papa on a wild and windy night. Out of the unforgiving weather, the mood of the crowd and the Prime Ministers themselves was warm. They put aside years of rivalry to pick apart the state of New Zealand's democracy, tell war stories and discuss what they thought about opening their legacies up for close inspection.

The evening, on September 8 2017, was full of humour and insight was a gathering to launch a book, published by Bridget Williams Books, which contains the transcripts of the broadcast interviews and essay by Tim Watkin and Guyon Espiner. We hope you enjoy sharing it with us.

Go to this episode on rnz.co.nz for more details