 The Thornberry s are in the Congo along the banks of the Congo River to film the African Clawless Otter where they are waiting for Tyler Tucker to join them. Tyler and Eliza are cousins and close in age and very competitive with each other. When the commvee is put out of commission they take a small steamer boat named Prudence up the river in search of the otter. Tyler is not aware of all the dangers that the wild can hold and soon has them heading straight for disaster.