Twins, Grace and Marty, along with a mysterious uncle, are dropped into the middle of the Congolese jungle in search of their missing photojournalist parents.
To avoid foster home care while their mother is recuperating from illness, three children run off to the home of a grandmother they have never seen, where they find a cold reception and a terrible secret.
Rosamond looks into her crystal ball to read Nate the Great's future and sees a new case for him to solve--her money box is missing and she wants him to find it.