Billy Knight, an ex-LAPD officer, is busy coping with runaway marlin and out-of-control tourists in Key West when an old friend from the force drops in.

"A fishing guide and part-time investigator, Hannah Smith is a tall, strong Florida woman descended from many generations of the same. But the problem before her now is much older even than that. Five hundred years ago, Spanish conquistadors planted the first orange seeds in Florida, but now the whole industry is in trouble. The trees are dying at the root, weakened by infestation and genetic manipulation, and the only solution might be somehow, somewhere,...