Randy Wayne White

After a summer of tagging sharks off the west coast of Florida, Sabina, Maribel, and Luke have a new assignment: searching for "survivor trees" that are resistant to the disease that is destroying the state's citrus trees; the search takes them to the remote mangrove islands of Sanibel Island, where they discover Spanish oranges, a grave, an immense saltwater crocodile, a reclusive woman who believes that the ghost of a dead king, beheaded by Spanish...

Marine biologist Doc Ford enlists the help of three kids--Luke, Maribel, and Sabina--to tag sharks for his research and help take down poachers targeting Florida's biannual migration of blacktip sharks.