David Fisher reports on how close New Zealand and coalition forces got to a daring rescue mission for Kiwi nurse Louisa Akavi.

Her codename was Raupo. Those who fought to free Red Cross nurse Louisa Akavi from Islamic State rarely used her name.

The Herald can now report details from inside the hunt for Akavi, which has seen confidence over her location and survival diminish over the week since it was learned she would lose the shield of secrecy presumed to have protected her since October 2013.

It shows the degree of focus and intensity which has consumed our diplomatic,