On Maui, Hawaii, two brothers, 12-year-old Akoni and 10-year-old Micah, both stand up paddle boarders, modify an ocean-going kayak to be a stand up paddle kayak. This starts their adventure to paddle the kayak to Molokai, the nearby island where their native Hawaiian grandmother lives. Their crossing is adventurous as they encounter dangerous currents and playful dolphins. They learn from their grandmother that their grandfathers many generations back were Kahunas, spiritual leaders and healers. This information inspires Akoni to think about being a Kahuna, too. On their return trip to Maui, currents and strong wind forces them out to sea beyond Maui, where they have to deal with life threatening events. Will the boys survive?