A few years after their previous get-together, Bertram Lynch and his pal, Deane, are invited across the Equator again, this time to the large island of New Guinea, asked by the British Governor there to help locate four explorers who vanished in the Murray Mountain Range. Finding them in that remote area will be difficult. Learning what they were doing, whether it was to find gold in those hills or mounting a coup, that will prove deadly to pair.