The third and final chapter of the alien known as the Elf Man. Both fascinated and warped by his observance of humans over centuries, the Elf Man plots the demise of the species he abhors, homo sapiens. To that end the alien employs the advanced technology of his civilization to accelerate rocket science in Nazi Germany, secure in the knowledge that humans will eventually employ missiles for their own destruction.

The Elf Man, also known as Beobachter Parallax, initiates his plan at the onset of World War 2. The human tools of the alien are the Grass and Schmidt families. Using one Gerhard Schmidt, employed in Werner Von Braun's development of the V2 Rocket, the Elf Man plots the arms race of nuclear weapons and their missile development delivery systems. The plan leads Gerhard and other German scientists to the United States and to a future that invites an apocalypse.

The novel describes the alien's discovery of the Rift in a parallel universe that connects their planet to the Earth, and their numerous expeditions beginning in the 14th century. The Elf Man's confined space on Earth in Germany and his extended life span puts him in direct contact over centuries with the violent Grass clan, as well as the Schmidt family who have prominent positions in local society. The deadly interactions of Grass and Schmidt's, often manipulated by the alien, forms the backdrop to a future set in 2042 .

We again meet characters from the first two books. Professor Dieter Schmidt, now an old man in 2042 called to his destiny with the alien. Inspector Willy Schreiber, now on the trail of one Kaspar Grass. Anton Schmidt, a child genius who is destined to be the final pawn in the Elf Man's plan. Joseph Mountain, Chumash tribe elder, and Vic Tran, police chief. All meet in a final showdown with the Elf Man in Box Canyon California, the site where the first novel of the trilogy began.

Science fiction and history meet, along with a dystopian near future to a dark conclusion. So Dieter Called him Elf Man, a dramatic end to the Elf Man story.