With their father jailed for sinking a river boat, Noah Underwood and his younger sister, Abbey, must gather evidence that the owner of this casino is emptying his bilge tanks into the waters around their Florida Keys home.

Come along on a rollicking thrill-ride down the Amazon with wisecracking skipper Frank Wolff and intrepid researcher Dr. Lily Houghton. Lily travels from London, England to the Amazon jungle and enlists Frank₂s questionable services to guide her downriver on La Quila, his ramshackle-but-charming boat. Lily is determined to uncover an ancient tree with unparalleled healing abilities, possessing the power to change the future of medicine. Thrust on...