The Expeditioners and the Secret of King Triton's Lair

Siblings Kit, Zander, and M. K. West are settling into their new lives as students at the Academy for the Exploratory Sciences when Kit finds another mysterious map left for him by their father, the famous Explorer Alexander West. As two world powers come to the brink of war, Kit, Zander, M.K., and their friend Sukey must travel to a hidden island in the Caribbean, known for its deadly storms, and unlock its secrets, hoping they have the courage to follow the trail of maps wherever it may lead.