In "Hawaiian Sea Hunt Mystery," Biff Brewster, his father, and their friends embark on a thrilling adventure in the captivating setting of Hawaii. Their quest involves uncovering the secrets of a missing sloop and a hidden mine, leading them into a dangerous confrontation with ruthless criminals. The mystery deepens when a seasoned scientist, holding crucial information, is kidnapped by these adversaries. As Biff and his companions navigate treacherous landscapes and perilous waters, they must outwit their foes and unravel the truth behind the missing vessel and the valuable treasure it carries.