Five Weeks in a Balloon

A scholar, Dr. Samuel Ferguson, accompanied by his manservant Joe and his friend Richard "Dick" Kennedy, sets out to travel across the African continent — still not fully explored — with the help of a hot-air balloon filled with hydrogen.
It is the first Verne novel in which he perfected the "ingredients" of his later work, skillfully mixing a plot full of adventure and twists that hold the reader's interest with passages of technical, geographic, and historic description. The book gives readers a glimpse of the exploration of Africa, which was still not completely known to Europeans of the time, with explorers traveling all over the continent in search of its secrets.