Rod Sterling narrated a series based on a book by what German author?
In Search of... (TV series):  All three featured narration by Rod Serling, who was the initial choice to host the spin-off show. Chariots of the Gods?:  Unsolved Mysteries of the Past (German: "Erinnerungen an die Zukunft: Ungelöste Rätsel der Vergangenheit" ; in English, "Memories of the Future: Unsolved Mysteries of the Past") is a book authored in 1968 by Erich von Däniken.
Erich von Däniken