This series, known in English as The Progenitors' War , consists of three main volumes originally published between 2019 and 2021.

( A Gulf in the Past ): The crew travels back in time to seek lost technology.

The first book in Chris Kennedy's military science fiction series, (English title: A Gulf in Time ), follows the crew of the Vella Gulf as they face an ancient, overwhelming threat known as the "Enemy". Series Overview: Der Krieg der Progenitor

( A Gulf in Time ): The discovery of the Progenitors' rod triggers the arrival of their ancient Enemy.