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...

For Valentina, living on the Galápagos islands means spending her days outside, observing the natural world around her. She greets sea lions splashing on the shore, scampers over lava rocks with Sally-lightfoot crabs, and swims with manta rays. She is a Galápagos girl, and there is no other place she'd rather be!