While her father is in the hospital, thirteen-year-old Isla befriends Harry, the first boy to understand her love of the outdoors, and as Harry's health fails, Isla tries to help both him and the lone swan they see, struggling to fly, on the lake outside Harry's window.

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...