After the bad guys are stopped, Molly and Grainne and the O'Hare family expect the rest of their trip to Mexico to be uneventful. Unfortunately, they couldn't be more wrong. Join Molly and her seven foot long Irish wolfhound as they travel the west coast of Mexico, see amazing things, and discover that the adventure with the diamonds isn't over yet.
 
Will they ever find the diamonds? Who are Moonie and Sunshine really? Will they find out who lost the book, and what do dolphins, manatees and a purple octopus have to do with it?