I think the books are called in the English like this idk if it is published in England but maybe it is
Het zonnepad.
Donderwolken.
Het eerste gevecht.
De vlammende ster.
Het verscheurde woud.
Pad van de sterren.
This are the names of the books in dutch
So maybe use an translator to translate the words??

Wel uhm its like a serie before 1
It's about how it all began and how the cats became a clan