Done reading these books:
4. Die Chroniken von Amber 1 - Die neun Prinzen von Amber (The Chronicles of Amber 1 - Nine Princes in Amber), Roger Zelazny, 268 pages
5. Die Chroniken von Amber 2 - Die Gewehre von Avalon (The Chronicles of Amber 2 - The Guns of Avalon), Roger Zelazny, 300 pages
6. Die Chroniken von Amber 3 - Im Zeichen des Einhorns (The Chronicles of Amber 3 - Sign of the Unicorn), Roger Zelazny, 271 pages
7. Die Chroniken von Amber 4 - Die Hand Oberons, Roger (The Chronicles of Amber 4 - The Hand of Oberon), Roger Zelazny, 272 pages
8. Die Chroniken von Amber 5 - Die Burgen des Chaos (The Chronicles of Amber 5 - The Courts of Chaos), Roger Zelazny, 222 pages
The Chronicles of Amber are a series of fantasy novels. The main character is Corwin, who at the start of the books suffers from Amnesia. If that sounds like an old trope to you then your'e right - however, the first book was written in 1970. Soon Corwin finds out that he is part of a family with magical abilities that lives in Amber - basically a fantasy parallel world, unlike the one where Corwin was thrown in after getting his memory damaged by an unknown party.
Corwin manages to gather some knowledge from one of his family members that was sent to the "Shadow Earth (same as our earth, basically) to watch over him and make sure he stays unaware of his past. He manages to return to Amber and from here unfolds a fight over the throne, that is currently up for taking after the old King, Oberon, mysteriously vanished.
Enjoyable series. The writing style felt pretty modern to me, I was surprised to find out that the books are fairly old. Apparently there is also a series of books called the Merlin Cycle that plays after these ones as well.