Five Weeks in a Balloon the need to release gas or throw ballast overboard to control his altitude, allows very long trips to be taken. This voyage is meant to link together the voyages of Sir Richard Burton and John Hanning Speke in East Africa with those of Heinrich Barth in the regions of the Sahara and Chad. The trip begins in Zanzibar on the east coast, and passes across Lake Victoria, Lake Chad, Agadez, Timbuktu, Djenné and Ségou to St Louis in modern-day Senegal on the west coast. The book describes the unknown interior of Africa near modern-day Central African Republic as a desert,
The Strange Affair of Spring-Heeled Jack and explorer John Hanning Speke. It includes actual historical events, namely the Spring-heeled Jack case, the assassination attempt on Queen Victoria in 1840, the search for the source of the Nile and the development of Darwin's theory of Evolution. A time-traveller from the distant future returns to 1840 to prevent an ancestor from attempting to commit an act of regicide. After failing in his mission, he returns to 1837 and recruits the 'Mad Marquess' to find his ancestor and correct the error. The result of his interference is an altered timeline in which technological advances have given rise to two