Blue gold : a novel from the Numa files

An investigation into the sudden deaths of a pod of gray whales leads National Underwater and Marine Agency leader Kurt Austin to the Mexican coast, where someone tries to put him and his mini-sub permanently out of commission. Meanwhile, in South America's lush hills, a specially assigned NUMA(R) team discovers a murdered body--a member of a mysterious local tribe, who live like ghosts beyond a five-part waterfall the locals call the Hand of God...