Showing Devil-Devil by Graeme Kent

It's 1960 and Sergeant Ben Kella of the Solomon Islands police force is only a few days into a routine patrol of the most beautiful yet dangerous and primitive areas of the South Pacific. Yet, already, he has been cursed by a magic man, stumbled across evidence of a cult uprising and failed to find an American anthropologist who has been scouring the mountainous jungle in search of a priceless erotic icon.

To complicate matters further, at a local mission station, Kella discovers the redoubtable Sister Conchita secretly trying to bury a skeleton, before a mysterious gunman tries to kill her.

Mission-educated yet an aofia - the traditional peacemaker of the islands - Kella is forced to link up with Sister Conchita, an independent and rebellious young American nun, in order to track down the perpetrators of a series of bizarre murders . . .