In 1953, birds begin to die, and the unidentified bodies of Erik and Yasin are discovered. Police chief Daniel Kahnwald (Ines' father) and officer Egon Tiedemann are puzzled by the boys' odd outfits.

Ulrich arrives from 2019 and meets several locals, including newcomer Agnes Nielsen and her son Tronte, who are about to rent a room in the Tiedemann house.

A watchmaker named H.G. Tannhaus, who disclaims knowledge of the book found in Helge's 2019 home. Deperately asking question to him about the book and its connection.

Through the young Ines and Jana, Ulrich learns of the two bodies, and when introduced to the 9-year-old Helge, he believes killing him will save the lives of the boys.

Ulrich bludgeons Helge and leaves him for dead in the bunker. Later, Tannhaus finds Ulrich's smartphone.

In 1986, the Stranger meets with an elderly Tannhaus, who shares his theory of time travel through wormholes.

The Stranger confirms his theories and states that such a wormhole, allowing people to travel 33 years into the past or future, exists in Winden. 

He asks Tannhaus to fix a broken brass device of his, so he can destroy the wormhole. Tannhaus later brings out the original version of the device, studying them side by side.