In which our intrepid travellers navigate the vast and mysterious expanse of Lake Victoria, observing its inhabited shores, rich wildlife, and intriguing geography under the vigilant eye of Dr. Ferguson, who is propelled by the quest to uncover the enigmatic sources of the Nile. After a suspenseful descent upon an island marked by the etchings of a previous explorer, they confirm their discovery with the proud display of the English flag before continuing their voyage.