In The ClueFinders 5th Grade Adventures: Secret of the Living Volcano The ClueFinders are on a mission with Captain Clark, Leslie's sailor grandfather, to find out why so many ships have been disappearing in a certain area of the Pacific Ocean. In one of the wrecked ships, Joni and Santiago discover a pair of metal plaques with strange symbols written on them called CrypTiles. However, when their ship comes into view of a tiny uncharted island, a tsunami promptly forms and hits their ship. Joni, Santiago and LapTrap are stranded on the island and set off to rescue their remaining team members, locate Captain Clark and his crew and find out what sort of activities are happening on the island.