This is a suspenseful and adventurous book. Jeff, Shauna, Brandon, and Meg are finally going on their free cruise with their family, when on the night before boarding the cruise ship the ( just Jeff, Shauna, Brandon, and Meg) go on a yacht their old friend wants to show them some stuff and people. They see Dr. Anthony, a person who tried to steal an old valuable book and would do anything to get it from them, who had been in jail for a year, and they are scared and hide on the boat. The boat leaves, and they end up meeting up with an old tribe that they know from an earlier vacation, and the tribe wants to stay hidden. The children and friends from the tribe have to stop the other people from bringing home evidence, but Dr. Anthony is willing to kidnap...