In the novel, Mace Windu's death is a major turning point. It shows the dark side of the Force taking over. His death also symbolizes the fall of the Jedi Order as he was one of the prominent Jedi. It leaves a power vacuum that the Sith can then manipulate more easily.
Palpatine is often involved. Since he is a master manipulator in the Star Wars universe, he could be the one who subtly guides Windu towards the dark side. He might offer false promises or twist Windu's sense of justice to make him question the Jedi way.
It could be an ancient shinobi who has mastered some kind of death - related jutsu and has ascended to a higher state of being. This shinobi might have been forgotten in the history of the ninja world.
I'm not sure exactly as I haven't read it in detail. But it likely focuses on the adventures and stories related to Mace Windu. It might include his battles, his relationships with other Jedi, and his role in the Star Wars universe.
Yes, there are quite a few. Some focus on Mace Windu's journey after surviving, perhaps seeking revenge on Palpatine or reuniting with the Jedi Order in hiding. For example, in one fanfiction he teams up with other surviving Jedi to undermine the Sith's new regime.
Mace Windu was a powerful Jedi Master. He was known for his purple lightsaber, which was quite unique among the Jedi. He was highly skilled in lightsaber combat and was a respected member of the Jedi Council. He played important roles in many galactic events and conflicts, often being a key figure in the fight against the dark side.