With help from their cousin Harry, eight-year-old twins Ella and Ethan discover who is illegally taking coral from the reefs near their aunt and uncle's beach house on the shore of Australia's Coral Sea.

"Mustique is in a state of breathless calm as tropical storm Cristobal edges towards it across the Atlantic. Most villa owners have escaped the island but a few young socialites remain, unwilling to let summer's partying end. American heiress Amanda Fortini is one such thrill-seeker - until she heads out for a morning swim and doesn't return. Detective Sergeant Solomon Nile is just 28 years old and the island's only fully trained police officer. He...