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"A Journey Through Time"

"A Journey Through Time" is a paperback book written by H.G. Tannhaus, Winden's clockmaker. The publishing house Minotaurus printed a 500-copy edition of the book in 1981.

The work contains the basic theoretical framework for time travel: Einstein-Rosen bridges, wormholes, the Bootstrap Paradox, the lunar-solar cycle, and much more. The author's fundamental hypothesis is: Time is not linear. Past, present, and future are intertwined and influence one another.

A Winden Bestseller

Helge Doppler gifts Claudia Tiedemann the book in 1986, upon her being named director of the nuclear power plant. He also has his own copy. In 2019, Ulrich Nielsen finds the book in the nursing home on Helge's nightstand and takes it with him.

In 1953, Ulrich shows the book to the clockmaker. It is the first time H.G. Tannhaus has ever seen it. The Stranger has also read the book and discusses its contents in depth with the clockmaker during his visit in 1986.

Spoiler alert
Spoiler

Season 2 : episode 3

The book's origin

How does H.G. Tannhaus know enough about physics and the theory of relativity to author a book about time travel? He asked himself the same question at first, but then he simply copied it word for word from the book Claudia Tiedemann brought him from the future. This means the book's contents have no origin – a Bootstrap Paradox that can only result from time travel.