Alison has relocated her research to Puerto Rico. Alison and her team are expanding their IMIS technology to include primates. They're facilitating communications between researcher DeeAnn Draper and her young gorilla. Then the opportunity arises for DeeAnn and her gorilla to help on a search for one of DeeAnn's old friends.
John's investigation in Brazil eventually converges with DeeAnn's search. Just in time from DeeAnn's perspective. What they find in the South American jungle makes the ring they found in the Caribbean seem trivial. Another great science adventure. Very highly recommended.